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Calculus 2 : Derivatives

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Example Questions

Example Question #97 : Derivative At A Point

Calculate the derivative of f(x)=2sin(4x)+3sin(10x)+5sin(3x)+11sin(6x) at the point $x=\frac{\pi}{2}$ .

Possible Answers:

Correct answer:

Explanation:

There are 2 steps to solving this problem.

First, take the derivative of f(x) .

Then, replace the value of x with the given point and evaluate.

For example, if x=a , then we are looking for the value of f'(x=a) , or the derivative of f(x) at x=a .

f(x)=2sin(4x)+3sin(10x)+5sin(3x)+11sin(6x)

Calculate f'(x) .

Derivative rules that will be needed here:

$\frac{\mathrm{d} }{\mathrm{d} t} sin(kt) = kcos(kt)$

f'(x)=8cos(4x)+30cos(10x)+15cos(3x)+66cos(6x)

Then, plug in the value of x and evaluate.

$\newline f'(x=\frac{\pi}{2})=8cos(2\pi)+30cos(5\pi)+15cos(\frac{3\pi}{2})+66cos(3\pi) = 8*1+30*-1+15*0+66*-1=8-30-66=-88$

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Example Question #181 : Derivatives

Calculate the derivative of f(x)=cos(3x)+sin(x) at the point $x=\pi$ .

Possible Answers:

$\pi$

Correct answer:

Explanation:

There are 2 steps to solving this problem.

First, take the derivative of f(x) .

Then, replace the value of x with the given point and evaluate.

For example, if x=a , then we are looking for the value of f'(x=a) , or the derivative of f(x) at x=a .

f(x)=cos(3x)+sin(x)

Calculate f'(x)

Derivative rules that will be needed here:

$\frac{\mathrm{d} }{\mathrm{d} t} cos(kt) = -ksin(kt)$
$\frac{\mathrm{d} }{\mathrm{d} t} sin(kt) = kcos(kt)$

f'(x)=-1*3sin(3x)+cos(x)

Then, plug in the value of x and evaluate.

$f'(x=\pi)=-3sin(3\pi)+cos(\pi) = -3*0-1 = -1$

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Example Question #101 : Derivative At A Point

Calculate the derivative of $f(x)=cos(5x)+ 3e^{3x}+6x^3$ at the point x=3 .

Possible Answers:

-5sin(15)+9e^9+162

-5sin(5)+9e^3+162

-5sin(15)+e^9+162

Correct answer:

-5sin(15)+9e^9+162

Explanation:

There are 2 steps to solving this problem.

First, take the derivative of f(x) .

Then, replace the value of x with the given point and evaluate.

For example, if x=a , then we are looking for the value of f'(x=a) , or the derivative of f(x) at x=a .

$f(x)=cos(5x)+ 3e^{3x}+6x^3$

Calculate f'(x)

Derivative rules that will be needed here:

Taking a derivative on a term, or using the power rule, can be done by doing the following: $\frac{\mathrm{d} }{\mathrm{d} t} t^n = n * t^{n-1}$
Special rule when differentiating an exponential function: $\frac{\mathrm{d} }{\mathrm{d} t} e^{kt} = ke^{kt}$ , where k is a constant.
$\frac{\mathrm{d} }{\mathrm{d} t} cos(kt) = -ksin(kt)$

$f'(x)=-5sin(5x)+9e^{3x}+18x^2$

Then, plug in the value of x and evaluate.

$\newline f'(x=3)=-5sin(5*3)+9e^{3*3}+18*3^2=-5sin(15)+9e^9+18*9 = -5sin(15)+9e^9+162$

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Example Question #182 : Derivative Review

Determine the derivative of the following function at x=2 .

$e^{x^2-3x+2}-ln{x^2}$

Possible Answers:

e^3-1

e^3

Correct answer:

Explanation:

For this function we will need to use the power rule, the exponential rule, and the chain rule.

Power Rule: $x^n \rightarrow nx^{n-1}$

Exponential Rule: $e^u \rightarrow e^u\cdot \frac{du}{dx}$

Chain Rule: $[f(g(x))]'\rightarrow f'(g(x))\cdot g'(x)$

Applying these rules to our function we get the following derivative.

$\frac{\mathrm{d} }{\mathrm{d} x}(e^{x^2-3x+2}-ln{x^2})= (2x-3)e^{x^2-3x+2}-\frac{2}{x}$

Now, plug in x=2 to solve,

$(2*2-3)e^{2^2-3*2+2}-\frac{2}{2}=1-1=0$ .

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Example Question #183 : Derivative Review

Find the derivative of the following function at x=0 :

$f(x)=\frac{e^x\cos(x)}{3}$

Possible Answers:

$\frac{1}{3}$

$-\frac{1}{3}$

Correct answer:

$\frac{1}{3}$

Explanation:

The derivative of the function is

$f'(x)=\frac{1}{3}(e^x\cos(x)-e^x\sin(x))$

and was found using the following rules:

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

$\frac{\mathrm{d} }{\mathrm{d} x} e^u=e^u\frac{\mathrm{du} }{\mathrm{d} x}$ ,

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

Evaluated at the point x=0, we get

$f'(0)=\frac{1}{3}(1-0)=\frac{1}{3}$ .

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Example Question #181 : Derivatives

Find the derivative of the following function at the point x=0 :

$f(x)=\frac{2x^3+x^2+e^x}{3x+1}$

Possible Answers:

Correct answer:

Explanation:

The derivative of the function is

$f'(x)=\frac{(3x+1)(6x^2+2x+e^x)-3(2x^3+x^2+e^x)}{(3x+1)^2}$

and was found using the following rules:

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

$\frac{\mathrm{d} }{\mathrm{d} x} x^n=nx^{n-1}$ ,
$\frac{\mathrm{d} }{\mathrm{d} x}e^u=e^u\frac{\mathrm{du} }{\mathrm{d} x}$ .

Now, plug in the point x=0 into the above function:

$f'(x)=\frac{(3(0)+1)(6(0)^2+2(0)+e^{(0)})-3(2(0)^3+(0)^2+e^{(0)})}{(3(0)+1)^2}$

$f'(x)=\frac{(1)(1)-3(1)}{(1)^2}$

$f'(0)=\frac{-2}{1}=-2$

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Example Question #185 : Derivative Review

Find the derivative of the following function at the point x=0 :

$f(x)=\tan(x)-\frac{3x}{4}$

Possible Answers:

$\frac{3}{4}$

$\frac{1}{4}$

$\frac{5}{4}$

Correct answer:

$\frac{1}{4}$

Explanation:

The derivative of the function is

$f'(x)=\sec^2(x)-\frac{3}{4}$

and was found using the following rules:

$\frac{\mathrm{d} }{\mathrm{d} x} \tan(x)=\sec^2(x)$ ,

$\frac{\mathrm{d} }{\mathrm{d} x} x^n=nx^{^{n-1}}$

Now, plug in the given point into the first derivative function:

$f'(0)=1-\frac{3}{4}=\frac{1}{4}$

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Example Question #186 : Derivative Review

Find the derivative of the following function at x=0 :

$f(x)=x^3\cos(x)+\sin(3x)$

Possible Answers:

Correct answer:

Explanation:

The derivative of the function is

$f'(x)=3x^2\cos(x)-x^3\sin(x)+3\cos(3x)$

and was found using the following rules:

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

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

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

$\frac{\mathrm{d} }{\mathrm{d} x}x^n=nx^{n-1}$

Now, plug in the point we want into the derivative and solve:

f'(0)=0-0+3(1)=3

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Example Question #187 : Derivative Review

Evaluate the derivative at the point $\theta=\pi$ :

$f(\theta)=\cos^2(\theta)+e^\theta$

Possible Answers:

$2\pi$

$e^\pi$

Correct answer:

$e^\pi$

Explanation:

The derivative of the function is

$f'(\theta)=-2\cos(\theta)\sin(\theta)+e^\theta$

and was found using the following rules:

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

$\frac{\mathrm{d} }{\mathrm{d} x} e^u=e^u\frac{\mathrm{du} }{\mathrm{d} x}$ ,

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

$\frac{\mathrm{d} }{\mathrm{d} x} x^n=nx^{n-1}$ .

Now, plug in the point asked into the above function and solve:

$f'(\pi)=0+e^\pi=e^\pi$

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Example Question #182 : Derivatives

Find the derivative of the following function at $\theta=\pi$ :

$f(\theta)=\tan(\theta)+\theta e^\theta$

Possible Answers:

$e^\pi (\pi+1)$

$e^\pi (\pi-1)$

$e^\pi (\pi+1)+1$

$e^\pi (\pi+1)-1$

Correct answer:

$e^\pi (\pi+1)-1$

Explanation:

The derivative of the function is

$f'(\theta)=\sec^2(\theta)+e^\theta+\theta e^\theta$

and was found using the following rules:

$\frac{\mathrm{d} }{\mathrm{d} x} f(x)g(x)=f'(x)g(x)+f(x)g'(x)$ , $\frac{\mathrm{d} }{\mathrm{d} x} e^u=e^u\frac{\mathrm{du} }{\mathrm{d} x}$ , $\frac{\mathrm{d} }{\mathrm{d} x} \tan(x)=\sec^2(x)$

Finally, plug in $\pi$ for $\theta$ and we get our final answer:

$f'(\theta)=e^\pi (\pi+1)-1$

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Calculus 2 : Derivatives

Study concepts, example questions & explanations for Calculus 2

All Calculus 2 Resources

Example Questions

Example Question #97 : Derivative At A Point

Example Question #181 : Derivatives

Example Question #101 : Derivative At A Point

Example Question #182 : Derivative Review

Example Question #183 : Derivative Review

Example Question #181 : Derivatives

Example Question #185 : Derivative Review

Example Question #186 : Derivative Review

Example Question #187 : Derivative Review

Example Question #182 : Derivatives

All Calculus 2 Resources

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