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AP Calculus AB : Computation of the Derivative

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Example Questions

Example Question #38 : Derivative Rules For Sums, Products, And Quotients Of Functions

Find the derivative of the following function:

$h(x)=\frac{x}{x^{2}+1}$

Possible Answers:

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

$\frac{1}{2x}$

$\ln(x+1)$

$\frac{1-x^{2}}{x^{4}+2x^{2}+1}$

None of the other answers

Correct answer:

$\frac{1-x^{2}}{x^{4}+2x^{2}+1}$

Explanation:

Because we are dealing with a quotient that cannot be simplified, we use the quotient rule, which states that if

$h(x)=\frac{f(x)}{g(x)}$ ,

$h{}'(x)=\frac{(g(x)f{}'(x)-f(x)g{}'(x))}{(g(x))^{2}}$ .

By observing the given equation

$h(x)=\frac{x}{x^{2}+1}$ ,

we can see that

f(x)=x

and

$g(x)=x^{2}+1$ .

Therefore, the derivative is

$\frac{(x^{2}+1)(1)-(x)(2x)}{(x^{2}+1)^{2}}=\frac{1-x^{2}}{x^{4}+2x^{2}+1}$ .

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Example Question #39 : Derivative Rules For Sums, Products, And Quotients Of Functions

Find the derivative of the following equation:

$h(x)=\frac{x}{\ln (x)}$

Possible Answers:

$\frac{\ln ^{2}(x)}{\ln (x)-1}$

None of the other answers.

$\frac{\ln (x)}{(\ln (x)-1)^{2}}$

$\frac{\ln (x)-1}{\ln ^{2}(x))}$

$\ln(x)-1$

Correct answer:

$\frac{\ln (x)-1}{\ln ^{2}(x))}$

Explanation:

Because we are differentiating a quotient that cannot be simplified, we must use the quotient rule, which states that if

$h(x)=\frac{f(x)}{g(x)}$ ,

then

$h{}'(x)=\frac{g(x)f{}'(x)-f(x)g{}'(x)}{(g(x))^{2}}$ .

By observing the given equation,

$h(x)=\frac{x}{\ln (x)}$ ,

we see that in this case,

f(x)=x

and

$g(x)=\ln(x)$ .

Given this information, the quotient rule tells us that

$h{}'(x)=\frac{\ln (x)(1)-(x)(\frac{1}{x})}{(\ln (x)^{2})}=\frac{\ln (x)-1}{\ln ^{2}(x)}$ .

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Example Question #40 : Derivative Rules For Sums, Products, And Quotients Of Functions

Find the derivative of the following equation:

$h(x)=\sin( \frac{x^{2}}{x+1})$

Possible Answers:

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

$\frac{x(x+2)}{(x+3)^{2}}\cos(\frac{x^{2}}{x+1})$

None of the other answers.

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

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

Correct answer:

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

Explanation:

This problem is a quotient rule inside of a chain rule. First, let's look at the chain rule:

Given this, we can deduce that since

$h(x)=\sin(\frac{x^{2}}{x+1})$ ,

$f(x)=\sin(x)$

and

$g(x)=\frac{x^{2}}{x+1}$ .

By plugging these into the chain rule formula, we get

$(f o g(x)){}'=\cos(\frac{x^{2}}{x+1})((\frac{d}{dx}(\frac{x^{2}}{x+1})))$

To find the derivative of the

second term, we must use the quotient rule, which states that the the derivative

of a quotient is ((denominator)(derivative of numerator)-(numerator)(derivative

of denominator))/(denominator squared). Using this rules we find that

$\frac{d}{dx}(\frac{x^{2}}{x+1})=\frac{((x+1)(2x)-(x^{2})(1))}{(x+1)^{2}}=\frac{x(x+2)}{(x+1)^{2}}$ .

By plugging this back in, we find the final derivative to be

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

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Example Question #244 : Computation Of The Derivative

Find the derivative of the function:

$f=\frac{\tan(x)+5}{x}$

Possible Answers:

$\frac{x\sec^2(x)-\tan(x)-5}{x}$

$\frac{x\sec(x)-\tan(x)-5}{x^2}$

$\frac{x\sec^2(x)-\tan(x)-5}{x^2}$

$\frac{x\sec^2(x)-\tan(x)+5}{x^2}$

Correct answer:

$\frac{x\sec^2(x)-\tan(x)-5}{x^2}$

Explanation:

The derivative of the function is equal to

$f'=\frac{x\sec^2(x)-\tan(x)-5}{x^2}$

and was found using the following rules:

$\frac{\mathrm{d} }{\mathrm{d} x} \frac{f(x)}{g(x)}=\frac{g(x)f'(x)-f(x)g'(x)}{g(x)^2}$ , $\frac{\mathrm{d} }{\mathrm{d} x} \tan(x)=\sec^2(x)$ , $\frac{\mathrm{d} }{\mathrm{d} x} ax=a$

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Example Question #41 : Derivative Rules For Sums, Products, And Quotients Of Functions

Find the derivative of the function

$f=\frac{e^x}{\cos{x}}$

Possible Answers:

$f'=\frac{e^x\cos{x}-e^x\sin{x}}{\cos^2{x}}$

$f'=\frac{e^x\cos{x}+e^x\sin{x}}{\cos{x}}$

$f'=\frac{e^x\cos{x}+e^x\cos{x}}{\cos^2{x}}$

$f'=\frac{e^x\cos{x}+e^x\sin{x}}{\cos^2{x}}$

Correct answer:

$f'=\frac{e^x\cos{x}+e^x\sin{x}}{\cos^2{x}}$

Explanation:

To find the derivative of a quotient, you apply the quotient rule:

$\frac{\mathrm{d} }{\mathrm{d} x}(\frac{f(x)}{g(x)})=\frac{{f'(x)g(x)-f(x)g'(x)}}{(g(x))^2}$

In our case, we have f(x)=e^x and $g(x)=\cos{x}$

Using the function from the problem statement and taking its derivative, we get

$f'=\frac{e^x\cos{x}+e^x\sin{x}}{\cos^2{x}}$

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Example Question #42 : Derivative Rules For Sums, Products, And Quotients Of Functions

Find the derivative of the function

$f=\frac{\cos{x}}{2x^2}$

Possible Answers:

$f'=\frac{-2x^2\sin{x}-4x\cos{x}}{2x^4}$

$f'=\frac{-2x^2\sin{x}-4x\sin{x}}{4x^4}$

$f'=\frac{-x^2\sin{x}-4x\cos{x}}{2x^4}$

$f'=\frac{-2x^2\sin{x}-4x\cos{x}}{4x^4}$

Correct answer:

$f'=\frac{-2x^2\sin{x}-4x\cos{x}}{4x^4}$

Explanation:

To find the derivative of a quotient, you apply the quotient rule:

$\frac{\mathrm{d} }{\mathrm{d} x}(\frac{f(x)}{g(x)})=\frac{{f'(x)g(x)-f(x)g'(x)}}{(g(x))^2}$

In our case, we have $f(x)=\cos{x}$ and g(x)=2x^2

Using the function from the problem statement and taking its derivative, we get

$f'=\frac{-2x^2\sin{x}-4x\cos{x}}{4x^4}$

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Example Question #43 : Derivative Rules For Sums, Products, And Quotients Of Functions

Find the derivative of the function

$f=2x\sin{x}+2\cos{x}$

Possible Answers:

$f'=2x\cos{x}$

$f'=2x\cos{x}+2\sin{x}$

$f'=-2x\cos{x}$

$f'=2\cos{x}$

Correct answer:

$f'=2x\cos{x}$

Explanation:

To find the derivative of the function, you must apply the product rule. The product rule is as follows

$\frac{\mathrm{d} }{\mathrm{d} x}(f(x)g(x))=f'(x)g(x)+f(x)g'(x)$

In the first part of the expression, we have f(x)=2x and $g(x)=\sin{x}$ , and in the second part of the expression we have f(x)=2 and $g(x)=\cos{x}$

Using the product rule from above, we have

$f'=2\sin{x}+2x\cos{x}-2\sin{x}=2x\cos{x}$

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Example Question #44 : Derivative Rules For Sums, Products, And Quotients Of Functions

Find the derivative of the function

$f=5x^2\tan{x}$

Possible Answers:

$f'=10x\tan{x}+5x^2\sec^2{x}$

$f'=10\tan{x}+5x^2\sec^2{x}$

$f'=10x\tan{x}-5x^2\sec^2{x}$

$f'=10x\tan{x}+5x^2\sec{x}$

Correct answer:

$f'=10x\tan{x}+5x^2\sec^2{x}$

Explanation:

To find the derivative of the function, you must apply the product rule. The product rule is as follows

$\frac{\mathrm{d} }{\mathrm{d} x}(f(x)g(x))=f'(x)g(x)+f(x)g'(x)$

In this case, we have f(x)=5x^2 and $g(x)=\tan{x}$

Using the product rule from above, we have

$f'=10x\tan{x}+5x^2\sec^2{x}$

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Example Question #45 : Derivative Rules For Sums, Products, And Quotients Of Functions

Find the derivative.

$\frac{2x+1}{x^2}$

Possible Answers:

$\frac{1}{x}$

x-1

2x+1

Correct answer:

x-1

Explanation:

Use the quotient rule to find the derivative.

$\frac{d}{dx}\frac{2x+1}{x^2}=\frac{x^2(2)-2x(2x+1)}{2x}$

$=\frac{2x^2-4x^2-2x}{2x}$

$=\frac{-2x^2-2x}{2x}$

$=\frac{-x^2-x}{x}=x-1$

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Example Question #41 : Derivative Rules For Sums, Products, And Quotients Of Functions

Find the derivative.

$x^2\sin (x)$

Possible Answers:

$x\cos (x)+2x\cos (x)$

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

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

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

Correct answer:

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

Explanation:

Use the product rule to find the derivative.

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

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AP Calculus AB : Computation of the Derivative

Study concepts, example questions & explanations for AP Calculus AB

All AP Calculus AB Resources

Example Questions

Example Question #38 : Derivative Rules For Sums, Products, And Quotients Of Functions

Example Question #39 : Derivative Rules For Sums, Products, And Quotients Of Functions

Example Question #40 : Derivative Rules For Sums, Products, And Quotients Of Functions

Example Question #244 : Computation Of The Derivative

Example Question #41 : Derivative Rules For Sums, Products, And Quotients Of Functions

Example Question #42 : Derivative Rules For Sums, Products, And Quotients Of Functions

Example Question #43 : Derivative Rules For Sums, Products, And Quotients Of Functions

Example Question #44 : Derivative Rules For Sums, Products, And Quotients Of Functions

Example Question #45 : Derivative Rules For Sums, Products, And Quotients Of Functions

Example Question #41 : Derivative Rules For Sums, Products, And Quotients Of Functions

All AP Calculus AB Resources

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