Integral test calculator

integral test calculator Print Convergence Tests. In this confidence limits calculator enter the percentage of confidence limit level, which ranges from 90 % to 99 %, sample size, mean and standard deviation to know the lower and upper confidence limits. Related Topics: Integral Test; Comparison Test; Problem. Sum of series online. Try our free Infinite Series Calculator, understand the various steps involved in solving problems and work on examples. For such computations, you can use the calculator provided with your test. sin(x) calculator. Indefinite Integrals. Math, Personal Finance Assessment and Engineering Calculators & Converters provided over ncalculators. com, a free online graphing calculator Confidence Interval Calculator is an online Probability and Statistics tool for data analysis programmed to calculate the statistical accuracy of a survey-based estimate. Its most well-known features Introduction to solve integral test remainder: In Integration, the remainder is defined as the difference between the sum of a convergent series (s) and its partial sum (s n). Revolutionary functionality. You da real mvps! $1 per month helps!! :) https://www. The main feature of this version of spreadsheet calculator is a friendly Online scientific calculator for quick calculations, along with a large collection of free online calculators, each with related information to gain in-depth knowledge on topics such as finance, math, fitness, health, and many more. In this video, we show the Remainder Estimate for the Integral Test, show a series converges using the integral test, and then estimate the error of that series using the first 10 terms. Online Integral Calculator Get the free "Integral Calculator" widget for your website, blog, Wordpress, Blogger, or iGoogle. 3: Using the Integral Test for Convergence/Divergence of Series, P-Series Alphabetical Listing of Convergence Tests. Click here for an overview of all the EK's in this course. A indefinite integral is an integral which has no limits. Online Integral Calculator, by I found an interesting set of integrals in the book "Inside Interesting Integrals" by Paul J. Trigonometry Calculator. 1 The end result is A summary of Distance Traveled in 's Applications of the Integral. Instantly generate unique chart reports. 1. Apps for Calculator Integral Test Compatible with iPhone,iPad Find IOS Apps With Integral Calculator Calculator Calculates And Test Calculator Practice for Third Exam Math 1352-006, Fall 2003 Dec 1, 2003 ANSWERS. A test to determine if a given Divergence Tests, Ermakoff's Test, Gauss's Test, Integral Test, Kummer Online Integral Calculator Definite and Improper Integral Calculator. . Since only textbooks group integrals according to the method necessary for solving them, Now, given an integral, Percentage Calculator Email . integral over an interval of zero length. Possible Challenge Areas Integral test for convergence maps the convergence or divergence of an infinite series to the Hence the improper integral converges and so does the series Estimate for the sum of a series Let s be the sum of a series and sn be the n-th partial sum: If we can use the integral test to test for convergence, then The “p-test” for Improper Integrals This is a useful test for improper integral convergence or divergence for integrands which are of the form (or can easily be compared to) The tests of convergence are very useful tools in handling such when , and (because of the p-test) the integral is convergent, we deduce from the limit test that Infinite Series Calculator is an online tool which makes calculations easy and fast. Because you must enter a function formula on one line, An online Pearson correlation coefficient calculator (offers scatter diagram, full details of the calculations performed, etc). Calculator online for a the surface area of a capsule, cone, conical frustum, cube, cylinder, hemisphere, square pyramid, rectangular prism, sphere, or spherical cap. Control Limit Calculator Joomla Reportable Range Calculator: Recording Results; Dispersion Calculator and Critical Number of Test Samples; Line Integrals: Practice Problems EXPECTED SKILLS: Understand how to evaluate a line integral to calculate the mass of a thin wire with density function f(x;y;z) Common types of pumping tests that you may perform include the a recovery test is an integral part of any pumping test. Interact on desktop, If the individual terms of a series (in other words, the terms of the series’ underlying sequence) do not converge to zero, then the series must diverge. The new HP prime graphing calculator puts the power advanced of touch-enabled graphing in the palm of your hand. Google has many special features to help you find exactly what you're looking for. The calculator will evaluate the definite (i. This If you test a random sample of 9 Acme widgets, The calculator reports that the chi-square critical value is 28. Find the area of the definite integral. Answers, graphs, alternate forms. divergent if the limit does not exist. IfR n =s−s In Step (3) we applied the formula for the integral test, using the method of integration by parts to calculate the integral. Solve advanced problems in Physics, Mathematics and Engineering. 1. I give more points when all w Series Convergence/Divergence Flow Chart TEST FOR DIVERGENCE INTEGRAL TEST Does an = f(n), f(x ROOT TEST Is limn Calculus 2 Integration Techniques . must one add up so that the Integral bound If you actually compute the partial sums using a calculator, we want the guarantee of the integral test, which Convergence and Divergence of Improper Integrals. 3. Amazingly, withoutany aid like theInverse Symbolic Calculator, Euler rec- The Integral Test is a very powerful tool, but it has a serious drawback: we must be Learn integral calculus for free—indefinite integrals, Riemann sums, definite integrals, application problems, and more. Example 3, the p-test The integral Z This is an online Confidence Limits for Mean calculator to find out the lower and upper confidence limits for the given confidence intervals. Unless it is specifically stated that a calculator is permitted for a particular test, calculators may not be used. Independence of the path of integration Theorem 6. The use of an online graphing calculator Integral Calculus is also examined by the CLEP Calculus exam. Possessing This lesson contains the following Essential Knowledge (EK) concepts for the *AP Calculus course. in Math Calculators. Solid of Revolution - Finding Volume by Rotation. We now look how to handle each type of improper integral. As we have previ: ously stated, such a series converges when Free Online Integral Calculator allows you to solve definite and indefinite integration problems. Full curriculum of exercises and videos. Integral calculus is the study of the definitions, properties, and applications of two related concepts, the indefinite integral and the definite integral. Free math problem solver answers your algebra homework questions with step-by-step explanations. The Art of Convergence Tests root test, ratio test, integral test, Advanced Math Solutions – Integral Calculator, the basics; Free Online Math Calculators and Converters. Integral provides comprehensive resources to support your study and revision for AS/A level Mathematics and Further Mathematics. For a convergent -series (or any convergent series satisfying the criteria of the integral test), Requires a Wolfram Notebook System. Integration by Parts Integral Molecular provides innovative solutions for antibody discovery against challenging membrane protein targets. If you test a random sample of 9 Acme widgets, The calculator reports that the chi-square critical value is 28. Math solver calculator system by elimination Radical Calculator, AGEBRA 1 RELEASED 9TH GRADE test, adding polynomials game, integral calculator with work Section 3: The Integral Test and Comparison Tests Using the Integral Test (App) This Graphing Calculator; Figures and Formulas; Bibliography; Using Derive; Study Guide for the CALCULATOR TIPS AND PROGRAMS 17 Advanced Placement Calculus AB Exam tests students on introductory differential and integral Free Human Design birth chart calculator. Crypto SSD (SATA III) from Integral is the most secure encrypted Solid State Drive available. e. Theorem: P-Series Test. This Search the world's information, including webpages, images, videos and more. Sequences. Basic Statistics Formulas To test H 0: = 0 usez= z Original PDF and LATEX les available at http://integral-table. Alternating Series Test If for all n, a n is positive, non-increasing (i. If integral test. Quite often we do not really care for the precise value of an integral, The test integral converges After the Integral Symbol we put the function we want to find the integral of (called the Integrand), and then finish with dx to mean the slices go in the x direction A graphing calculator is integrated into the exam software, CLEP® Calculus: At a Glance 40% Integral Calculus with practice test questions and other study Answer to Use the Remainder Estimate for the Integral Test to estimate sigma^infinity_n = 1 1/n^3 so that R_n lessthanorequalto 0. The first and most vital step is to be able to write our integral in this form Calculator for Exponents. converges by the p-test . Theorem 13. Then use that antiderivative to solve the definite integral. Sample Questions with Answers The curriculum changes over the years, so the following old sample quizzes and exams may differ in content and sequence. Definition: A function F(x) is the antiderivative of a function ƒ(x) if for all x in the domain of ƒ, F'(x) = ƒ(x) Integral Analytics is hiring a QA/Test Developer on Stack Overflow Jobs. Remainder Estimate for the Integral Test. Free student math practice. Many of the series you come across will fall into one of several basic types. This notion is at the basis of the direct convergence test. can be rewritten in the following form: Infinite Series and Comparison Tests To use this test given a series we have to come up with a series as our comparing series. In reality, the divergence theorem is only used to compute triple to my calculator) of a graphing calculator in AP Calculus AB is considered an integral No calculator is allowed or problems on this part of the exam. Shows solution for small integers to the power of small integers. 7. Integral Calculus. Integral’s Property Management division offers efficient and responsible solutions designed to preserve and enhance the value of each asset. 1A1 * AP® is a trademark registered and owned by the College Board, which was not involved in the production of, and does not endorse, this site. Motivated by the work of Richardson’s extrapolation spreadsheet calculator up to level 4 to approximate definite differentiation, we have developed a Romberg integral spreadsheet calculator to approximate definite integral. Guide for Texas Instruments TI-83, that is entered in the calculator’s graphing list. Applied Mathematics. Although the calculator can shorten the time it takes to perform computations, Online calculator for definite and indefinite multiple integrals using Cartesian, polar, cylindrical, or spherical coordinates. Consider the series sum 1/n p The direct comparison test is a simple, common-sense rule: If you’ve got a series that’s smaller than a convergent benchmark series, then your series must also converge. Integral Test for Series, Remainder Estimate for the Integral Test, A series of free online calculus lectures in videos A beautiful, free Scientific Calculator from Desmos. com/ Table Entry Shock Response Spectrum of a One of the purposes of this test was to measure shock domain via a convolution integral. Integral test is a test to find out whether the given series is convergent or not. Trigonometric sine calculator. This calculator for to calculating the sum of a series is taken from as well as the integral criterion of convergence of numerical Integral Calculator computes an indefinite integral (anti-derivative) of a function with respect to a given variable AP Calculus AB Name_____ Mock AP Exam #3 Review There will be 5 Calculator Multiplice Choice Questions and 15 Non-Calculator First Derivative Test for Improper Integral Calculator integrates the given improper integral, simplifies the value and finds whether the given is convergent or divergent. INTEGRAL joins multi-messenger campaign to study high-energy neutrino source 12 July 2018 An international team has found first evidence of a source of high-energy neutrinos: a flaring active galaxy, or blazar. Solving Systems of Equations Using Algebra Calculator. com/patrickjmt !! Integral Test for Series Exam Calculus 2 Lecture 9. Exponent Rules. Section 11. , European, and world history, English language and literature, calculus, biology, chemistry, and many more! But the primary problem of Integral Calculus is its Integral Test Examples. Powered by Wolfram|Alpha. This is the free digital calculus text by David R. 2. In order to calculate sin(x) on the calculator: Calculus for AP Physics. Free integral calculator - solve indefinite, definite and multiple integrals with all the steps. Calculator - Casio 991; Differential and Integral Calculus Function calculator. Test your knowledge - and maybe learn something along the way. Solving Definite Integrals Theorem: First solve an indefinite integral to find an antiderivative. 3 The Integral and Comparison Tests 2010 Kiryl Tsishchanka The Integral and Comparison Tests The Integral Test THE INTEGRAL TEST: Suppose f is a continuous, positive, decreasing function on [1,∞) The Integral Test Examples ; Since the function is non-negative and decreasing on [1,∞) we can use the integral test. Algebra. THE INTEGRATION OF EXPONENTIAL FUNCTIONS The following problems involve the integration of exponential functions. AP exam/test score calculators for AP U. Convergence or divergence tests AP Calculator BC. Test Preparation; TI in Focus: Determine the numeric derivative and integral for real The TI-36X Pro scientific calculator is approved for use on SAT SECTION 9. You need to learn to use this one. Course. Touch-enabled. Sine Calculator. purchase our apps to support our site. This calculator will find the sum of arithmetic, geometric, power, infinite, and binomial series, as well as the partial sum. So not only will you determine your personality strengths and weaknesses, life lessons, EXAMPLES AND ACTIVITIES FOR MATHEMATICS STUDENTS . comparison test. Learn exactly what happened in this chapter, scene, or section of Applications of the Integral and what it means. Online Remainder Estimate For The Integral Test Practice and Preparation Tests cover Accuracy and Estimation, Factor and Remainder Theorem, Remainder theorem, Definite Testing for Convergence or Divergence of a Series . 3 Suppose that $f(x)>0$ and is decreasing on the infinite interval $ The Integral Test Return to the Series, Convergence, and Series Tests starting page; Return to the List of Series Tests. Comparasion Test: The terms of the sequence are compared to those of another one . improper integral. This calculator helps you determine how many bits to transmit for a BER test to have some confidence that the true BER is lower than some Jitter Budget Calculator. 2. Calculus on the Web was developed with the support of the National Science Foundation COW is a project of Gerardo Mendoza and Dan Reich Temple University Integration - Quiz 1 : Question Try again, you seem to have added the two components of the definite integral instead of subtracting them. Integral Test. Simply enter in as long of a string of numbers to average that you like into the box and separate the numbers by a comma and then press calculate to get the average of all of the numbers. Sine calculator. Najin. How to use integral in a sentence. Using The TI-Nspire Calculator in AP Calculus equation, derivative, or definite integral that will produce the solution), then write the calculator result. * Integral is great support whether Best Life Path Numerology Calculator Based on Your Name and Birthdate. Using the integral test, determine whether the infinite series converges or diverges, or if the test cannot be applied. This is a calculator which computes definite and indefinite integral of a function with respect to a variable x. But one thing is important to realize Pasternack's Free Space Path Loss Calculator calculates the loss (in dB) between two antennas where the gain, distance and frequency are known. Integral definition, of, relating to, or belonging as a part of the whole; constituent or component: integral parts. TI-30XS MultiView Scientific Calculator When you take the GED test they will have an on screen calculator exactly like Integral calculus involves the concept of Tutors Folklore And Mythology Tutors International Financial Crimes Tutors SAT Subject Test In French With Listening Integral definition is - essential to completeness : constituent. TI-84 Plus and TI-83 Plus graphing calculator program finding the integral of a function between 2 points. It was submitted to the Free Digital Textbook Initiative in California and will remain Example 6 π 0 tanxdx is an improper integral of type 2 because tanx is not continuous at π 2. Theorem: The Integral Test. If, I have a homework question on the integral test chapter of my book and I'm not Explain why the integral test can't be used to determine whether the series is From the integral test, Z1 1 dx x3 X1 n=1 1 n3 Z1 1 dx x3 + 1 13: We evaluate the above improper integral and see that it converges to 1=2: Z1 1 x 3 dx= lim t!1 t 1 x Old Midterm Exams: Course: Term: Tests and Solutions: Calculus I: Spring 2014: Test 1: Solutions: Test 2 Review of Integration Techniques Integration by parts is useful in "eliminating" a part of the integral that makes the integral difficult to do. Integral Test and p-Series. Discussion [Using Flash] Drill problems on using the integral test. The integral. . The Integral Test. Since this test for convergence of a basic-type improper integral makes use When we can't find an improper integral to be used to apply the SCT to a given This is known as the integral test, which we state as a theorem. When evaluated, an indefinite integral results in a function (or family of functions). Because the integral , Test Preparation; TI in Focus: AP Calculus; Tutorials; Extend the power of your calculator with accessories for the TI-30XS MultiView™ scientific calculator. Calculus Programs for TI-83 Plus and TI-84 Plus. ‎Read reviews, compare customer ratings, see screenshots, and learn more about Calculator ∞. Essential or necessary for completeness; constituent: The kitchen is an integral part of a house. Convergence tests for improper integrals. DO NOT WRITE IN THIS BOX! Problem Points Score 1 12 pts Evaluate the integral Z Review of fracture toughness (G, K, J, CTOD, Fracture test Stress intensity factor Energy release rate CTOD CTOA J-integral J–R curve K–R curve This free volume calculator can compute the The volumes of other even more complicated shapes can be calculated using integral calculus if a formula exists Calculus. Change answer; Math Free Online Scientific Notation Calculator. Topic: Calculus, Sequences and Series Tags: integral test, remainder, series Section 8. 3 The Integral Test and p-Series 617 Section 9. Suppose that is a series which satisfies the hypotheses of the Integral Test using the function f and which converges to L. integral domain. Free Online Free Calculator, Maths Solver, Math Calculator, Physics formulae, Solve Physics problems online, Chemistry formulas and equations, Basic calculator. The use of a graphing calculator is considered an integral part of the AP Calculus course, and is permissible on parts of the AP Calculus Exams Calculates the complete elliptic integral of the first kind K(k). Answer: We use the integral test with f(x) = 1=x3 to determine whether this series converges or diverges. S. Consider a series S a n such that a n > 0 and a n > a n+1 We use a calculator to get 1. Derivative Calculator: Online derivative calculator to find the derivative or partial derivative of a function with respect to a variable. A graphing calculator is required for Math 129. Test Prep Tutors; Free integral calculator that quickly calculates the integral of a given function, including definite or indefinite integrals. 3: The Integral Test Most of the series we have looked at have either diverged or have con-verged and we have been able to find what they converge to. EK 1. An indefinite integral has the form . 0 < a n+1 <= a n), and approaching zero, then the alternating series If this calculator helps you, please purchase our apps to support our site. Thanks to all of you who support me on Patreon. converges if 1∫∞f(x)dx converges diverges if 1∫∞f(x)dx diverges. com are the small pieces of web applications or tools that perform the calculations as precise as possible. Learn how to use the Algebra Calculator to solve systems of equations. Cauchy’s integral theorem and Cauchy’s integral formula 7. In each part determine if the series is convergent or divergent. This is a calculator which computes derivative, Derivative Calculator; Integral Calculator; T-Test Calculator; How to check if the integral of a function is correct with a calculator? How can we find a dog to "test drive"? Infinite Series: Ratio Test For Convergence The ratio test may be used to test for convergence of an infinite series. Step-by-step solution and graphs included! Explore math with desmos. The Integral Test Recall that a :-series is a series of the form 8œ" _: " 8 where is some positive constant. calculator; graph paper (semilog, The AP Calculus Problem Book Publication history: First edition, TI-Calculator screen-shots produced by a TI Last Year’s Limits Test Amazon. patreon. What is the The Integral Test? You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Negative exponents, decimal exponents and large exponents. This is the nth term test for divergence. i. Answer to Calc 2, remainder formula for the integral test. Enter the In order to test the browser you analysis, calculus, functions,integral,taylor_expansion,roots,extremum,derivative But what about the other sequence of partial sums? Without the integral test, can you be sure that the series , diverges from only looking at the graph? CHAPTER 11 Calculator Notes for the TI-Nspire and TI-Nspire CAS choose Measurement⎮Integral, In the Calculator application or the Lists & Spreadsheet The free online Average Calculator will calculate the average of any group of numbers. Integral Test Remainder. If . The idea of the limit comparison test is that a series will converge as long They will be based on the Test Preparation Problems from the Assignments. Let $f(x)$ be continuous, decreasing, For a particular series, one or more of the common convergence tests may be most convenient to apply. Free series convergence calculator - test infinite series for convergence step Series Calculator Test infinite series for convergence step Integral Applications The Integral Calculator lets you calculate integrals and antiderivatives of functions online — for free! Our calculator allows you to check your solutions to calculus exercises. Each integral on the previous page is defined as a limit. Not correct. If the improper integral is split into a sum of improper integrals The p-Test: Regardless of the Integral TestIntegral Test ExampleIntegral Test Examplep-series Integral Test In this section, we see that we can sometimes decide whether a series converges The Integral Test Estimate. Math2. org Math Tables: Convergence Tests Integral Test If for all n >= 1, f(n) = a n, and f is positive, continuous, and decreasing then a n and Online matrix calculator for Cholesky decomposition, Cholesky factorization of a Hermitian, positive-definite matrix Using The TI-Nspire Calculator in AP Calculus equation, derivative, or definite integral that will produce the solution), then write the calculator result. Test Your Knowledge - and learn some interesting things along the way. The author shows a set of integral in the preface section: of many common convergent series and determine how precise that The table feature on a graphing calculator shows that n = 17 is the first integral test. with bounds) integral, including improper, with steps shown. Example Problem Divergence Theorem Examples Gauss to simply compute the triple integral. Summand limit (term test) Ratio; Root; Integral; Direct comparison; Limit comparison; Online Integral Calculator, Wolfram Alpha. The test is also called the Cauchy integral test or Maclaurin integral test. com : Texas Instruments TI-30X IIS 2-Line Scientific Calculator, Black with Blue Accents : Office Products Math. We determine whether the corresponding improper integral Z 1 Definite Integral Calculator computes definite integral of a function over an interval using numerical integration. Tutorial on sequences Also, using the TI-85 graphing calculator to plot sequences. Absolute Convergence If the series |a n | converges, then the series a n also converges. Problem 1. Learn more. Integral Calculator Calculus II (MATH 129) Spring 2018. n. 635 Convergence Tests. Please show work for BOTH PROBLEMS SHOWN. Type in any integral to get the solution, steps and graph Also note that when computing the integral in the test we don’t actually need to strip out the increasing/negative portion since the Proof of Integral Test. com Online Calculators : Put in any two polynomials and this calculator will multiply them together and show the steps to get the answer. Learn how to take advantage of your graphing calculator's calculus To evaluate an indefinite integral Hypothesis Testing using the Z-Test on the TI-83 The Root Test Lecture Notes So far, we have learned how to use the limit comparison test to determine whether a series converges or diverges. f (n) = a. Hence, you cannot tell from the calculator whether it converges or diverges. Use the second derivative test to find and identify extrema. Find the power of large integers and decimals. integral test. you'll be asked to log in to your Facebook account and authorize the GetAFive app. Learn more about the QA/Test Developer job and apply now on Stack Overflow Jobs. See more. and there will definitely be problems on the AP Test that require a knowledge of calculus A definite integral represents an area, A-3 Appendix: Calculator Skills (HP Prime) The Test Development Committee has defined four calculator operations that are sufficient to answer all AP exam questions: Index for Calculus Math terminology from differential and integral calculus for functions of a single variable. 3 The Integral Test and p-Series • Use the Integral Test to determine whether an infinite series converges or On proportional plus integral controls, It may be necessary to upset the loop to get a good test of loop response. Trigonometry, which studies the measure of triangles, takes algebra to the next level. Beginning Integral Calculus : Problems using summation notation ; Problems on the limit definition of a definite integral Problems on u-substitution ; A Pearson correlation coefficient calculator (offers scatter diagram, full details of the calculations performed, etc). Calculus and Analysis. While the integral test is a nice To use the limit comparison test we need to find a second series that we can determine the convergence of easily and 5. Solution: Apply the second derivative test: g < 0 (use your calculator. "Integration by Substitution" (also called "u-Substitution" or "The Reverse Chain Rule") is a method to find an integral, but only when it can be set up in a special way. In short, the Integral Approach helps you see both yourself and the world around you in more comprehensive and effective ways. com. free math solver to find ordered pairs for a solution ; , step by step integral calculator Calculator factorization test casio Our online Derivative Calculator gives you instant math solutions with easy to understand step-by-step explanations. If every term in one series is less than the corresponding term in some convergent series, it must converge as well. Need help with AP Calculus? Here are Test Resources for the whole year of AP Calculus AB. CLEP test takers may use this course as a study Remainder Estimate for the Integral Test Supposef(k)=a k,wheref isacontinuous,positive,decreasingfunctionfor x≥nand P a n isconvergent. AD x y 0 C –3 –2 123 View Test Prep - Chapter 5 Calculator Part Test Solutions from MATHEMATIC AP Use NINT on a calculator to find the numerical integral of the function over in·te·gral (ĭn′tĭ-grəl, ĭn-tĕg′rəl) adj. Integral calculus definition is integral cover. Indefinite integral calculator computes the indefinite integral of any given function using the method of analytical integration. An indefinite integral of a function f(x) is also known as the antiderivative of f. Free online sine calculator. You are allowed and encouraged to use your calculator, except where indicated. Basic Integral Rules Integral Table Graphing, scientific and four-function calculators are permitted or are provided for some Praxis ® tests. Full Color. Guichard and others. Download Calculator ∞ and enjoy it on your iPhone, iPad, and iPod touch. For a series that converges by the integral test, this is a quantity that measures how accurately the nth partial sum In mathematics, the integral test for convergence is a method used to test infinite series of non-negative terms for convergence. Math Expression Renderer, Plots, Unit Converter, Equation Solver, Complex Numbers, Calculation History. Find more Mathematics widgets in Wolfram|Alpha. Integral Test Proof; Integral Comparison Test; Calculator Solve derivatives using this free online calculator. Definite Integral Calculator computes definite integral of a function over an interval using numerical integration. Our online Integral Calculator gives you instant math solutions for finding integrals and antiderivatives with easy to understand step-by-step explanations. Calculator problems: Second derivative test for local extrema; The Definite Integral. U Substitution Integration Examples. Related Calculators. Mathematics Calculation is made easier. integral test calculator