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Calculus 1 : Other Differential Functions

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Example Questions

Example Question #781 : Other Differential Functions

Find the derivative.

6x^2(4x^3+3x)

Possible Answers:

120x^4+52x^2

20x^4+52x^2

120x^3-52x^2

120x^4+32x^2

Correct answer:

120x^4+52x^2

Explanation:

Use the product rule to find the derivative.

6x^2(12x^2+3)+(4x^3+3x)12x=72x^4+18x^2+48x^4+36x^2

Combine like terms.

The derivative is 120x^4+52x^2 .

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Example Question #782 : Other Differential Functions

Find the derivative.

$\frac{2}{3x^4}$

Possible Answers:

$\frac{8}{3x^5}$

$\frac{8}{3x^8}$

$\frac{-8}{3x^5}$

$\frac{-8}{3x^8}$

Correct answer:

$\frac{-8}{3x^5}$

Explanation:

Use the quotient rule to find the derivative.

$\frac{3x^4(0)-2(12x^3)}{(3x^4)^2}=\frac{-24x^3}{9x^8}$

Simplify.

The derivative is $\frac{-8}{3x^5}$ .

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Example Question #783 : Other Differential Functions

Find the derivative.

$\frac{1}{x^5}$

Possible Answers:

$\frac{-5}{x^6}$

$\frac{5}{x^6}$

$\frac{-5}{x^5}$

$\frac{5}{x^6}$

Correct answer:

$\frac{-5}{x^6}$

Explanation:

Use the quotient rule to find the derivative.

$\frac{x^5(0)-1(5x^4)}{(x^5)^2}=\frac{-5x^4}{x^{10}}=\frac{-5}{x^6}$

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Example Question #784 : Other Differential Functions

Find the derivative.

$12x^{12}$

Possible Answers:

$144x^{11}$

$-12x^{12}$

$12x^{11}$

$144x^{12}$

Correct answer:

$144x^{11}$

Explanation:

Use the power rule to find the derivative.

$\frac{d}{dx}12x^{12}=144x^{11}$

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Example Question #781 : Other Differential Functions

Find the first derivative of the following function:

$f(x)=\sec(e^{\frac{4}{x}})$

Possible Answers:

$-\frac{4}{x^2}\sec(e^{\frac{4}{x}})\tan(e^{\frac{4}{x}})$

$\frac{4}{x^2}e^{\frac{4}{x}}\sec(e^{\frac{4}{x}})\tan(e^{\frac{4}{x}})$

$-\frac{4}{x}e^{\frac{4}{x}}\sec(e^{\frac{4}{x}})\tan(e^{\frac{4}{x}})$

$-\frac{4}{x^2}e^{\frac{4}{x}}\sec(e^{\frac{4}{x}})\tan(e^{\frac{4}{x}})$

Correct answer:

$-\frac{4}{x^2}e^{\frac{4}{x}}\sec(e^{\frac{4}{x}})\tan(e^{\frac{4}{x}})$

Explanation:

The first derivative of the function is equal to

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

and was found using the following rules:

$\frac{\mathrm{d} }{\mathrm{d} x}f(g(x))=f'(g(x))\cdot g'(x)$ , $\frac{\mathrm{d} }{\mathrm{d} x} \sec(x)=\sec(x)\tan(x)$ , $\frac{\mathrm{d} }{\mathrm{d} x} e^u=e^u \frac{\mathrm{du} }{\mathrm{d} x}$ , $\frac{\mathrm{d} }{\mathrm{d} x} x^n=nx^{n-1}$

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Example Question #2001 : Calculus

Find the first derivative of the function:

$f(x)=x^2\sin(e^{3x})$

Possible Answers:

$2x\sin(e^{3x})+x^2e^{3x}\cos(e^{3x})$

$2x\sin(e^{3x})+3x^2e^{3x}\cos(e^{3x})$

$2x\sin(e^{3x})+3x^2\cos(e^{3x})$

$2x\sin(e^{3x})+e^{3x}\cos(e^{3x})$

$2x\sin(e^{3x})+3x^2e^{3x}\sin(e^{3x})$

Correct answer:

$2x\sin(e^{3x})+3x^2e^{3x}\cos(e^{3x})$

Explanation:

The first derivative of the function is equal to

$f'(x)=2x\sin(e^{3x})+3x^2e^{3x}\cos(e^{3x})$

and was found using the following rules:

$\frac{\mathrm{d} }{\mathrm{d} x} f(x)g(x)=f'(x)g(x)+f(x)g'(x)$ , $\frac{\mathrm{d} }{\mathrm{d} x} x^n=nx^{n-1}$ , $\frac{\mathrm{d} }{\mathrm{d} x} f(g(x))=f'(g(x))\cdot g'(x)$ , $\frac{\mathrm{d} }{\mathrm{d} x} e^u=e^u\frac{\mathrm{du} }{\mathrm{d} x}$ , $\frac{\mathrm{d} }{\mathrm{d} x} \sin(x)=\cos(x)$

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Example Question #785 : Other Differential Functions

Find the derivative.

5-x^2

Possible Answers:

x^2

-x^2

-2x

Correct answer:

-2x

Explanation:

Use the power rule to find the derivative.

$\frac{d}{dx}5=0$

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

Thus, the derivative is -2x .

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Example Question #786 : Other Differential Functions

Find the derivative.

$\frac{4}{x^3}$

Possible Answers:

$\frac{12}{x^4}$

$\frac{8}{x^4}$

$\frac{-12}{x^4}$

$\frac{-8}{x^4}$

Correct answer:

$\frac{-12}{x^4}$

Explanation:

Use the quotient rule to find the derivative. $\frac{x^3(0)-4(3x^2)}{(x^3)^2}=\frac{-12x^2}{x^6}=\frac{-12}{x^4}$

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Example Question #787 : Other Differential Functions

Find the derivative.

5x^2(4x^3-2x)

Possible Answers:

70x^4

100x^4-20x^2

100x^4-30x^2

70x^2

Correct answer:

100x^4-30x^2

Explanation:

Use the product rule to find this derivative.

5x^2(12x^2-2)+(4x^3-2x)10x

Distribute.

60x^4-10x^2+40x^4-20x^2

Combine like terms.

100x^4-30x^2 is the derivative.

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Example Question #788 : Other Differential Functions

Find the derivative at x=0.

4x^2-6x

Possible Answers:

Correct answer:

Explanation:

First, use the power rule to find the derivative.

$\frac{d}{dx}4x^2=8x$

$\frac{d}{dx}-6x=-6$

Thus, the derivative is 8x-6 .

Now, substitute 0 for x.

8(0)-6=-6

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Calculus 1 : Other Differential Functions

Study concepts, example questions & explanations for Calculus 1

All Calculus 1 Resources

Example Questions

Example Question #781 : Other Differential Functions

Example Question #782 : Other Differential Functions

Example Question #783 : Other Differential Functions

Example Question #784 : Other Differential Functions

Example Question #781 : Other Differential Functions

Example Question #2001 : Calculus

Example Question #785 : Other Differential Functions

Example Question #786 : Other Differential Functions

Example Question #787 : Other Differential Functions

Example Question #788 : Other Differential Functions

All Calculus 1 Resources

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