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AP Calculus AB : Comparing relative magnitudes of functions and their rates of change

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Example Questions

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Example Question #51 :Asymptotic And Unbounded Behavior

Evaluate:

$\int cos(2x)dx$

Possible Answers:

$(\frac{1}{2})sin(2x)+C$

2sin(2x)

-2sin(2x)

2cos(2x)

$-\frac{1}{2}sin(2x)$

Correct answer:

$(\frac{1}{2})sin(2x)+C$

Explanation:

The antiderivative of cos(x) = sin(x) . The derivative of sin(2x) = 2cos(2x) . However, since there is no 2 in the original integral, we must divide sin(2x) by 2. Therefore, the answer is (1/2)sin(2x)+C.

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Example Question #31 :Comparing Relative Magnitudes Of Functions And Their Rates Of Change

Evaluate the integral:

$\int (x^3-2x^2+5x-1) dx$

Possible Answers:

$\frac{x^4}{4}-\frac{2x^3}{3}+\frac{5x^2}{2}-x+C$

3x^2-4x+5+C

${4x^4}-6x^3+5x+C$

x^4-6x^3+10x^2-x +C

Correct answer:

$\frac{x^4}{4}-\frac{2x^3}{3}+\frac{5x^2}{2}-x+C$

Explanation:

When taking the antiderivative add one to the exponent and then divide by the exponent.

$\frac{x^{3+1}}{4}-\frac{2*x^{2+1}}{3}+\frac{5x^{1+1}}{2}-\frac{1*x^{0+1}}{1}$

$\frac{x^4}{4}-\frac{2x^3}{3}+\frac{5x^2}{2}-x+C$

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Example Question #32 :Comparing Relative Magnitudes Of Functions And Their Rates Of Change

Evaluate the integral:

$\int (e^x)dx$

Possible Answers:

e^x +C

e^0

$e^{x^2}+C$

Cannot be evaluated

$\frac{e^{x^2}}{2}+C$

Correct answer:

e^x +C

Explanation:

The derivative of e^x=e^x . Therefore, the antiderivative of e^x is equal to itself.

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Example Question #61 :Functions, Graphs, And Limits

Evaluate:

$\int_{-4}^{4} (x^{9} + tan(x) - x^{3}cos(x))dx$

Possible Answers:

$5\pi$

Can't be determined from the information given.

Correct answer:

Explanation:

$f(x) = x^{9} + tan(x) - x^{3}cos(x)$ and

$f(-x) = (-x)^{9} + tan(-x) - (-x)^{3}cos(-x) =$

$-x^{9} - tan(x) + x^{3}(cos(x)) =$

$-[x^{9} + tan(x) - x^{3}(cos(x))] = -f(x)$

Recall that tan(x) is an odd function and cos(x) is an even function.

Thus, since f(x) is an odd function, the integral of this function fromtowill be zero.

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Example Question #61 :Functions, Graphs, And Limits

Evaluate this indefinite integral:

$\int sin^{4}(x)cos^{3}(x)dx$

Possible Answers:

$\frac{sin^{5}(x)}{5} + \frac{sin^{7}(x)}{7} + C$

$\frac{cos^{7}(x)}{7} - \frac{cos^{5}(x)}{5}$

$\frac{sin^{5}(x)}{5} - \frac{sin^{7}(x)}{7}$

$\frac{sin^{5}(x)}{5} - \frac{sin^{7}(x)}{7} + C$

$\frac{cos^{5}(x)}{5} - \frac{cos^{7}(x)}{7} + C$

Correct answer:

$\frac{sin^{5}(x)}{5} - \frac{sin^{7}(x)}{7} + C$

Explanation:

To approach this problem, first rewrite the integral expression as shown below:

$\int sin^{4}(x)cos^{2}(x)cos(x)dx$ .

Then, recognize that cos^2(x) = 1 - sin^2(x) , and substitute this into the integral expression:

$\int sin^{4}(x)(1-sin^{2}x)cos(x)dx$

Use substitution, letting u = sin(x) and du = cos(x)dx . The integral can then be rewritten as

$\int u^{4}(1-u^{2})du = \int (u^{4} - u^{6})du.$

Evaluating this integral gives

$\frac{u^{5}}{5} - \frac{u^{7}}{7} + C$ .

Finally, substituting u = sin(x) back into this expression gives the final answer:

$\frac{sin^{5}(x)}{5} - \frac{sin^{7}(x)}{7} + C$

(As this is an indefinite integral,must be included).

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Example Question #1 :Finding Integrals

Evaluate:

$\int_{1}^{e^{100}} \frac{1}{x}dx$

Possible Answers:

$\ln 100$

$\frac{1}{100}$

100

$\frac{100}{e}$

100e

Correct answer:

100

Explanation:

$\int_{1}^{e^{100}} \frac{dx}{x} = \ln e^{100} - \ln 1 = 100-0 = 100$

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Example Question #2 :Finding Integrals

Find $\int_{0}^{\pi} (\cos^{2}x+\sin^{2}x)dx$

Possible Answers:

$2\pi$

$\pi$

Correct answer:

$\pi$

Explanation:

This is most easily solved by recognizing that $\sin^{2}x+\cos^{2}x=1$ .

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Example Question #3 :Finding Integrals

$\int_{\pi}^{2\pi}\sin(2x){\mathrm{d} x}=?$

Possible Answers:

$\frac{1}{2}$

$\pi$

Correct answer:

Explanation:

Remember the fundamental theorem of calculus!

$\int_{a}^{b}f(x){\mathrm{d} x}=\int f(b){\mathrm{d} x}-\int f(a){\mathrm{d} x}$

Since our $f(x)=\sin(2x)$ , we can't use the power rule. Instead we end up with:

$\int f(x){\mathrm{d} x}=\int \sin(2x){\mathrm{d} x}=\frac{-\cos(2x)}{2}+c$

Remember to include the + c for any anti-derivative or integral taken!

Now we can plug that equation into our FToC equation:

$\int_{a}^{b}f(x){\mathrm{d} x}=(\frac{-\cos(2b)}{2}+c)-(\frac{-\cos(2a)}{2}+c)$

Notice that the c's cancel out. Plug in the given values for a and b and solve:

$\int_{\pi}^{2\pi}f(x){\mathrm{d} x}=(\frac{-\cos(4\pi)}{2})-(\frac{-\cos(2\pi)}{2})$

$\int_{\pi}^{2\pi}f(x){\mathrm{d} x}=(\frac{-1}{2})-(\frac{-1}{2})$

$\int_{\pi}^{2\pi}f(x){\mathrm{d} x}=0$

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Example Question #31 :Integrals

$\int \frac{3}{x}=$

Possible Answers:

$3x^{-1}+C$

$-3x^{-2}+C$

$-3e^{-x}$

$3x^{-2}+C$

$3\ln \left | x \right |+C$

Correct answer:

$3\ln \left | x \right |+C$

Explanation:

The integral of $\frac{1}{x}$ is $\ln \left | x \right |+C$ . The constant 3 is simply multiplied by the integral.

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Example Question #32 :Integrals

$\int cos(x)\sin(x){\mathrm{d} x}=?$

Possible Answers:

$-(\frac{1}{2}\cos^2(x)+c)$

$\frac{\cos(x)}{\sin(x)}+c$

$\frac{\sin(x)}{\cos(x)}+c$

$\sin(x)\cos(x)+c$

$\cos^2(x)sin^2(x)+c$

Correct answer:

$-(\frac{1}{2}\cos^2(x)+c)$

Explanation:

To integrate $\cos(x)\sin(x)$ , we need to get the two equations in terms of each other. We are going to use "u-substitution" to create a new variable,, which will equal $\cos(x)$ .

Now, if $u=\cos(x)$ , then

$\frac{\mathrm{d}u }{\mathrm{d} x}=\frac{\mathrm{d} }{\mathrm{d} x}\cos(x)=-sin(x)$

Multiply both sides by $\mathrm d {x}$ to get the more familiar:

${\mathrm{d} u}=-\sin(x)\mathrm{d}x$

Note that our $\mathrm d{u}=-\sin(x)$ , and our original equation was asking for a positive $\sin(x)$ .

That means if we want $\int\cos(x)\sin(x)$ in terms of, it looks like this:

$\int u\cdot (-\mathrm d{u}})$

Bring the negative sign to the outside:

$-\int u\mathrm d{u}$ .

We can use the power rule to find the integral of:

$-(\frac{1}{2}u^2+c)$

Since we said that $u=\cos(x)$ , we can plug that back into the equation to get our answer:

$-(\frac{1}{2}\cos^2(x)+c)$

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AP Calculus AB : Comparing relative magnitudes of functions and their rates of change

Study concepts, example questions & explanations for AP Calculus AB

All AP Calculus AB Resources

Example Questions

Example Question #51 :Asymptotic And Unbounded Behavior

Example Question #31 :Comparing Relative Magnitudes Of Functions And Their Rates Of Change

Example Question #32 :Comparing Relative Magnitudes Of Functions And Their Rates Of Change

Example Question #61 :Functions, Graphs, And Limits

Example Question #61 :Functions, Graphs, And Limits

Example Question #1 :Finding Integrals

Example Question #2 :Finding Integrals

Example Question #3 :Finding Integrals

Example Question #31 :Integrals

Example Question #32 :Integrals

All AP Calculus AB Resources

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