Calculus Examples

$f (x) = \cos (x) + \log (x) + \frac{1}{x^{2}} + x^{\frac{3}{4}}$

Step 1

By the Sum Rule, the derivative of $\cos (x) + \log (x) + \frac{1}{x^{2}} + x^{\frac{3}{4}}$ with respect to $x$ is $\frac{d}{d x} [\cos (x)] + \frac{d}{d x} [\log (x)] + \frac{d}{d x} [\frac{1}{x^{2}}] + \frac{d}{d x} [x^{\frac{3}{4}}]$ .

$\frac{d}{d x} [\cos (x)] + \frac{d}{d x} [\log (x)] + \frac{d}{d x} [\frac{1}{x^{2}}] + \frac{d}{d x} [x^{\frac{3}{4}}]$

Step 2

The derivative of $\cos (x)$ with respect to $x$ is $- \sin (x)$ .

$- \sin (x) + \frac{d}{d x} [\log (x)] + \frac{d}{d x} [\frac{1}{x^{2}}] + \frac{d}{d x} [x^{\frac{3}{4}}]$

Step 3

The derivative of $\log (x)$ with respect to $x$ is $\frac{1}{x \ln (10)}$ .

$- \sin (x) + \frac{1}{x \ln (10)} + \frac{d}{d x} [\frac{1}{x^{2}}] + \frac{d}{d x} [x^{\frac{3}{4}}]$

Step 4

Evaluate $\frac{d}{d x} [\frac{1}{x^{2}}]$ .

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Step 4.1

Rewrite $\frac{1}{x^{2}}$ as ${(x^{2})}^{- 1}$ .

$- \sin (x) + \frac{1}{x \ln (10)} + \frac{d}{d x} [{(x^{2})}^{- 1}] + \frac{d}{d x} [x^{\frac{3}{4}}]$

Step 4.2

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{- 1}$ and $g (x) = x^{2}$ .

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Step 4.2.1

To apply the Chain Rule, set $u$ as $x^{2}$ .

$- \sin (x) + \frac{1}{x \ln (10)} + \frac{d}{d u} [u^{- 1}] \frac{d}{d x} [x^{2}] + \frac{d}{d x} [x^{\frac{3}{4}}]$

Step 4.2.2

Differentiate using the Power Rule which states that $\frac{d}{d u} [u^{n}]$ is $n u^{n - 1}$ where $n = - 1$ .

$- \sin (x) + \frac{1}{x \ln (10)} - u^{- 2} \frac{d}{d x} [x^{2}] + \frac{d}{d x} [x^{\frac{3}{4}}]$

Step 4.2.3

Replace all occurrences of $u$ with $x^{2}$ .

$- \sin (x) + \frac{1}{x \ln (10)} - {(x^{2})}^{- 2} \frac{d}{d x} [x^{2}] + \frac{d}{d x} [x^{\frac{3}{4}}]$

Step 4.3

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 2$ .

$- \sin (x) + \frac{1}{x \ln (10)} - {(x^{2})}^{- 2} (2 x) + \frac{d}{d x} [x^{\frac{3}{4}}]$

Step 4.4

Multiply the exponents in ${(x^{2})}^{- 2}$ .

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Step 4.4.1

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$- \sin (x) + \frac{1}{x \ln (10)} - x^{2 \cdot - 2} (2 x) + \frac{d}{d x} [x^{\frac{3}{4}}]$

Step 4.4.2

Multiply $2$ by $- 2$ .

$- \sin (x) + \frac{1}{x \ln (10)} - x^{- 4} (2 x) + \frac{d}{d x} [x^{\frac{3}{4}}]$

Step 4.5

Multiply $2$ by $- 1$ .

$- \sin (x) + \frac{1}{x \ln (10)} - 2 x^{- 4} x + \frac{d}{d x} [x^{\frac{3}{4}}]$

Step 4.6

Raise $x$ to the power of $1$ .

$- \sin (x) + \frac{1}{x \ln (10)} - 2 (x^{1} x^{- 4}) + \frac{d}{d x} [x^{\frac{3}{4}}]$

Step 4.7

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$- \sin (x) + \frac{1}{x \ln (10)} - 2 x^{1 - 4} + \frac{d}{d x} [x^{\frac{3}{4}}]$

Step 4.8

Subtract $4$ from $1$ .

$- \sin (x) + \frac{1}{x \ln (10)} - 2 x^{- 3} + \frac{d}{d x} [x^{\frac{3}{4}}]$

Step 5

Evaluate $\frac{d}{d x} [x^{\frac{3}{4}}]$ .

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Step 5.1

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = \frac{3}{4}$ .

$- \sin (x) + \frac{1}{x \ln (10)} - 2 x^{- 3} + \frac{3}{4} x^{\frac{3}{4} - 1}$

Step 5.2

To write $- 1$ as a fraction with a common denominator, multiply by $\frac{4}{4}$ .

$- \sin (x) + \frac{1}{x \ln (10)} - 2 x^{- 3} + \frac{3}{4} x^{\frac{3}{4} - 1 \cdot \frac{4}{4}}$

Step 5.3

Combine $- 1$ and $\frac{4}{4}$ .

$- \sin (x) + \frac{1}{x \ln (10)} - 2 x^{- 3} + \frac{3}{4} x^{\frac{3}{4} + \frac{- 1 \cdot 4}{4}}$

Step 5.4

Combine the numerators over the common denominator.

$- \sin (x) + \frac{1}{x \ln (10)} - 2 x^{- 3} + \frac{3}{4} x^{\frac{3 - 1 \cdot 4}{4}}$

Step 5.5

Simplify the numerator.

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Step 5.5.1

Multiply $- 1$ by $4$ .

$- \sin (x) + \frac{1}{x \ln (10)} - 2 x^{- 3} + \frac{3}{4} x^{\frac{3 - 4}{4}}$

Step 5.5.2

Subtract $4$ from $3$ .

$- \sin (x) + \frac{1}{x \ln (10)} - 2 x^{- 3} + \frac{3}{4} x^{\frac{- 1}{4}}$

Step 5.6

Move the negative in front of the fraction.

$- \sin (x) + \frac{1}{x \ln (10)} - 2 x^{- 3} + \frac{3}{4} x^{- \frac{1}{4}}$

Step 6

Simplify.

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Step 6.1

Rewrite the expression using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$- \sin (x) + \frac{1}{x \ln (10)} - 2 \frac{1}{x^{3}} + \frac{3}{4} x^{- \frac{1}{4}}$

Step 6.2

Rewrite the expression using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$- \sin (x) + \frac{1}{x \ln (10)} - 2 \frac{1}{x^{3}} + \frac{3}{4} \cdot \frac{1}{x^{\frac{1}{4}}}$

Step 6.3

Combine terms.

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Step 6.3.1

Combine $- 2$ and $\frac{1}{x^{3}}$ .

$- \sin (x) + \frac{1}{x \ln (10)} + \frac{- 2}{x^{3}} + \frac{3}{4} \cdot \frac{1}{x^{\frac{1}{4}}}$

Step 6.3.2

Move the negative in front of the fraction.

$- \sin (x) + \frac{1}{x \ln (10)} - \frac{2}{x^{3}} + \frac{3}{4} \cdot \frac{1}{x^{\frac{1}{4}}}$

Step 6.3.3

Multiply $\frac{3}{4}$ by $\frac{1}{x^{\frac{1}{4}}}$ .

$- \sin (x) + \frac{1}{x \ln (10)} - \frac{2}{x^{3}} + \frac{3}{4 x^{\frac{1}{4}}}$

Step 6.4

Reorder terms.

$\frac{1}{x \ln (10)} - \frac{2}{x^{3}} + \frac{3}{4 x^{\frac{1}{4}}} - \sin (x)$