# 10.3 Usubstitution Definite Integralsap Calculus

The AP Calculus exams include a substantial amount of integration. So it’s very important to be familiar with integrals, numerous integration methods, and the interpretations and applications of integration. In this short article, we’ll take a look at some of the most common integrals on the test.

10.3 u Substitution Definite Integrals DEFINITE INTEGRAL ∫ ( ) CHANGE OF BOUNDARIES Evaluate the definite integrals using u substitution. ∫ ( )√ ( ) ∫ NOTES Evaluate the definite integrals using u substitution. This lesson contains the following Essential Knowledge (EK) concepts for the.AP Calculus course.Click here for an overview of all the EK's in this course. EK 1.1A1. 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.

For a quick review of integration (or, antidifferentiation), you might want to check out the following articles first.

And now, without further ado, here are some of the most common integrals found on the AP Calculus exams! Recover my files crack torrent crack.

## Common Integrals

1. MATH 142 - u-Substitution Joe Foster Practice Problems Try some of the problems below. If you get stuck, don’t worry! There are hints on the next page! But do try without looking at them ﬁrst, chances are you won’t get hints on your exam. ˆ 1 −1 3x2 p x3 +5dx 2. ˆ x3(2 +x4)5 dx 3. ˆ 7 0 √ 4+3xdx 4. ˆ 1 (1−6t)4 dt 5.
2. Definite integrals, like their relatives indefinite integrals, can sometimes be solved by using substitution. When computing definite integrals using substitution, the limits of the integral must be modified so they are in terms of the new variable, and not the old one.

The following seven integrals (or their close cousins) seem to pop up all the time on the AP Calculus AB and BC exams.

### 1. Remember your Trig Integrals!

Trigonometric functions are popular on the exam!

### 2. Simple Substitutions

You need to recognize when to use the substitution u = kx, for constant k. This substitution generates a factor of 1/k because du = kdx.

For example,

### 3. Common Integration By Parts

Integrands of the form xf(x) often lend themselves to integration by parts (IBP).

In the following integral, let u = x and dv = sin xdx, and use IBP. ### 4. Linear Denominators

Integrands of the form a/(bx + c) pop up as a result of partial fractions decomposition. (See AP Calculus BC Review: Partial Fractions). While partial fractions is a BC test topic, it’s not rare to see an integral with linear denominator showing up in the AB test as well.

The key is that substituting u = bx + c (and du = bdx) turns the integrand into a constant times 1/u. Let’s see how this works in general. Keep in mind that a, b, and c must be constants in order to use this rule.

### 5. Integral of Ln x

The antiderivative of f(x) = ln x is interesting. You have to use a tricky integration by parts.

Let u = ln x, and dv = dx.

By the way, this trick works for other inverse functions too, such as the inverse trig functions, arcsin x, arccos x, and arctan x. For example,

### 6. Using Trig Identities

For some trigonometric integrals, you have to rewrite the integrand in an equivalent way. In other words, use a trig identity before integrating. One of the most popular (and useful) techniques is the half-angle identity.

### 7. Trigonometric Substitution

It’s no secret that the AP Calculus exams consist of challenging problems. Perhaps the most challenging integrals are those that require a trigonometric substitution.

The table below summarizes the trigonometric substitutions.

For example, find the integral: Here, the best substitution would be x = (3/2) sin θ.

Now we’re not out of the woods yet. Use the half-angle identity (see point 6 above). We also get to use the double-angle identity for sine in the second line.

Note, the third line may seem like it comes out of nowhere. But it’s based on the substitution and a right triangle.

If x = (3/2) sin θ, then sin θ = (2x) / 3. Draw a right triangle with angle θ, opposite side 2x, and hypotenuse 3.

By the Pythagorean Theorem, we find the adjacent side is equal to:

That allows us to identify cos θ in the expression (adjacent over hypotenuse).

Finally, θ by itself is equal to arcsin(2x/3).

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Related Pages
Calculus: Integration
Calculus: Derivatives
Calculus Lessons

### Indefinite Integrals

The notation is used for an antiderivative of f and is called the indefinite integral.

The following is a table of formulas of the commonly used Indefinite Integrals. You can verify any of the formulas by differentiating the function on the right side and obtaining the integrand. Scroll down the page if you need more examples and step by step solutions of indefinite integrals.

Table Of Indefinite Integral Formulas

Example:
Find the general indefinite integral.

Solution:

### Definite Integrals And Indefinite Integrals

The connection between the definite integral and indefinite integral is given by the second part of the Fundamental Theorem of Calculus.

If f is continuous on [a, b] then

## 10.3 U-substitution Definite Integralsap Calculus Calculator

Take note that a definite integral is a number, whereas an indefinite integral is a function.

Example:
Evaluate

Solution:

Definition Of Indefinite Integrals

An indefinite integral is a function that takes the antiderivative of another function. It is visually represented as an integral symbol, a function, and then a dx at the end. The indefinite integral is an easier way to symbolize taking the antiderivative. The indefinite integral is related to the definite integral, but the two are not the same.

Antiderivatives And Indefinite Integrals

Example:
What is 2x the derivative of? This is the same as getting the antiderivative of 2x or the indefinite integral of 2x.

• Show Video Lesson Indefinite Integrals

Indefinite integrals are functions that do the opposite of what derivatives do. They represent taking the antiderivatives of functions.

A formula useful for solving indefinite integrals is that the integral of x to the nth power is one divided by n+1 times x to the n+1 power, all plus a constant term.

Indefinite Integrals, Step By Step Examples

## 10.3 U-substitution Definite Integralsap Calculus Integrals

Step 1: Add one to the exponent
Step 2: Divide by the same.

Example:
∫3x5, dx

More Indefinite Integral, Step By Step, Examples: With Square Root

Example:
∫3√x, dx

• Show Video Lesson

More Indefinite Integral, Step By Step, Examples: x In The Denominator

Example:
∫6/x4, dx

Complicated Indefinite Integrals

Not all indefinite integrals follow one simple rule. Some are slightly more complicated, but they can be made easier by remembering the derivatives they came from. These complicated indefinite integrals include the integral of a constant (the constant times x), the integral of ex (ex) and the integral of x-1 (ln[x]).

Indefinite Integration (Polynomial, Exponential, Quotient)

How to determine antiderivatives using integration formulas?

Example:

## 10.3 U-substitution Definite Integralsap Calculus Solver

1. ∫(3x2 - 2x + 1) dx
2. ∫3ex dx
3. ∫4/x dx

Basic Integration Formulas

Here are some basic integration formulas you should know.

• Show Video Lesson

### Definite Integral

The Definite Integral - Understanding the Definition.

Calculating A Definite Integral Using Riemann Sums - Part 1

This video shows how to set up a definite integral using Riemann Sums. The Riemann Sums will be computed in Part 2.

## 10.3 U-substitution Definite Integralsap Calculus Algebra

• Show Video Lesson

Calculating A Definite Integral Using Riemann Sums - Part 2

Try the free Mathway calculator and problem solver below to practice various math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.