Calculus Examples

$f (x) = \cos (x^{4}) (\frac{x}{x + 6})$

Step 1

Combine $\cos (x^{4})$ and $\frac{x}{x + 6}$ .

$\frac{d}{d x} [\frac{\cos (x^{4}) x}{x + 6}]$

Step 2

Differentiate using the Quotient Rule which states that $\frac{d}{d x} [\frac{f (x)}{g (x)}]$ is $\frac{g (x) \frac{d}{d x} [f (x)] - f (x) \frac{d}{d x} [g (x)]}{{g (x)}^{2}}$ where $f (x) = \cos (x^{4}) x$ and $g (x) = x + 6$ .

$\frac{(x + 6) \frac{d}{d x} [\cos (x^{4}) x] - \cos (x^{4}) x \frac{d}{d x} [x + 6]}{{(x + 6)}^{2}}$

Step 3

Differentiate using the Product Rule which states that $\frac{d}{d x} [f (x) g (x)]$ is $f (x) \frac{d}{d x} [g (x)] + g (x) \frac{d}{d x} [f (x)]$ where $f (x) = \cos (x^{4})$ and $g (x) = x$ .

$\frac{(x + 6) (\cos (x^{4}) \frac{d}{d x} [x] + x \frac{d}{d x} [\cos (x^{4})]) - \cos (x^{4}) x \frac{d}{d x} [x + 6]}{{(x + 6)}^{2}}$

Step 4

Differentiate using the Power Rule.

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Step 4.1

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

$\frac{(x + 6) (\cos (x^{4}) \cdot 1 + x \frac{d}{d x} [\cos (x^{4})]) - \cos (x^{4}) x \frac{d}{d x} [x + 6]}{{(x + 6)}^{2}}$

Step 4.2

Multiply $\cos (x^{4})$ by $1$ .

$\frac{(x + 6) (\cos (x^{4}) + x \frac{d}{d x} [\cos (x^{4})]) - \cos (x^{4}) x \frac{d}{d x} [x + 6]}{{(x + 6)}^{2}}$

Step 5

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = \cos (x)$ and $g (x) = x^{4}$ .

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Step 5.1

To apply the Chain Rule, set $u$ as $x^{4}$ .

$\frac{(x + 6) (\cos (x^{4}) + x (\frac{d}{d u} [\cos (u)] \frac{d}{d x} [x^{4}])) - \cos (x^{4}) x \frac{d}{d x} [x + 6]}{{(x + 6)}^{2}}$

Step 5.2

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

$\frac{(x + 6) (\cos (x^{4}) + x (- \sin (u) \frac{d}{d x} [x^{4}])) - \cos (x^{4}) x \frac{d}{d x} [x + 6]}{{(x + 6)}^{2}}$

Step 5.3

Replace all occurrences of $u$ with $x^{4}$ .

$\frac{(x + 6) (\cos (x^{4}) + x (- \sin (x^{4}) \frac{d}{d x} [x^{4}])) - \cos (x^{4}) x \frac{d}{d x} [x + 6]}{{(x + 6)}^{2}}$

Step 6

Differentiate using the Power Rule.

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Step 6.1

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

$\frac{(x + 6) (\cos (x^{4}) + x (- \sin (x^{4}) (4 x^{3}))) - \cos (x^{4}) x \frac{d}{d x} [x + 6]}{{(x + 6)}^{2}}$

Step 6.2

Multiply $4$ by $- 1$ .

$\frac{(x + 6) (\cos (x^{4}) + x (- 4 \sin (x^{4}) x^{3})) - \cos (x^{4}) x \frac{d}{d x} [x + 6]}{{(x + 6)}^{2}}$

Step 7

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

$\frac{(x + 6) (\cos (x^{4}) + x^{3} x^{1} (- 4 \sin (x^{4}))) - \cos (x^{4}) x \frac{d}{d x} [x + 6]}{{(x + 6)}^{2}}$

Step 8

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

$\frac{(x + 6) (\cos (x^{4}) + x^{3 + 1} (- 4 \sin (x^{4}))) - \cos (x^{4}) x \frac{d}{d x} [x + 6]}{{(x + 6)}^{2}}$

Step 9

Add $3$ and $1$ .

$\frac{(x + 6) (\cos (x^{4}) + x^{4} (- 4 \sin (x^{4}))) - \cos (x^{4}) x \frac{d}{d x} [x + 6]}{{(x + 6)}^{2}}$

Step 10

By the Sum Rule, the derivative of $x + 6$ with respect to $x$ is $\frac{d}{d x} [x] + \frac{d}{d x} [6]$ .

$\frac{(x + 6) (\cos (x^{4}) + x^{4} (- 4 \sin (x^{4}))) - \cos (x^{4}) x (\frac{d}{d x} [x] + \frac{d}{d x} [6])}{{(x + 6)}^{2}}$

Step 11

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

$\frac{(x + 6) (\cos (x^{4}) + x^{4} (- 4 \sin (x^{4}))) - \cos (x^{4}) x (1 + \frac{d}{d x} [6])}{{(x + 6)}^{2}}$

Step 12

Since $6$ is constant with respect to $x$ , the derivative of $6$ with respect to $x$ is $0$ .

$\frac{(x + 6) (\cos (x^{4}) + x^{4} (- 4 \sin (x^{4}))) - \cos (x^{4}) x (1 + 0)}{{(x + 6)}^{2}}$

Step 13

Simplify the expression.

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Step 13.1

Add $1$ and $0$ .

$\frac{(x + 6) (\cos (x^{4}) + x^{4} (- 4 \sin (x^{4}))) - \cos (x^{4}) x \cdot 1}{{(x + 6)}^{2}}$

Step 13.2

Multiply $- 1$ by $1$ .

$\frac{(x + 6) (\cos (x^{4}) + x^{4} (- 4 \sin (x^{4}))) - \cos (x^{4}) x}{{(x + 6)}^{2}}$

Step 14

Simplify.

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Step 14.1

Simplify the numerator.

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Step 14.1.1

Simplify each term.

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Step 14.1.1.1

Rewrite using the commutative property of multiplication.

$\frac{(x + 6) (\cos (x^{4}) - 4 x^{4} \sin (x^{4})) - \cos (x^{4}) x}{{(x + 6)}^{2}}$

Step 14.1.1.2

Expand $(x + 6) (\cos (x^{4}) - 4 x^{4} \sin (x^{4}))$ using the FOIL Method.

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Step 14.1.1.2.1

Apply the distributive property.

$\frac{x (\cos (x^{4}) - 4 x^{4} \sin (x^{4})) + 6 (\cos (x^{4}) - 4 x^{4} \sin (x^{4})) - \cos (x^{4}) x}{{(x + 6)}^{2}}$

Step 14.1.1.2.2

Apply the distributive property.

$\frac{x \cos (x^{4}) + x (- 4 x^{4} \sin (x^{4})) + 6 (\cos (x^{4}) - 4 x^{4} \sin (x^{4})) - \cos (x^{4}) x}{{(x + 6)}^{2}}$

Step 14.1.1.2.3

Apply the distributive property.

$\frac{x \cos (x^{4}) + x (- 4 x^{4} \sin (x^{4})) + 6 \cos (x^{4}) + 6 (- 4 x^{4} \sin (x^{4})) - \cos (x^{4}) x}{{(x + 6)}^{2}}$

Step 14.1.1.3

Simplify each term.

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Step 14.1.1.3.1

Rewrite using the commutative property of multiplication.

$\frac{x \cos (x^{4}) - 4 x (x^{4} \sin (x^{4})) + 6 \cos (x^{4}) + 6 (- 4 x^{4} \sin (x^{4})) - \cos (x^{4}) x}{{(x + 6)}^{2}}$

Step 14.1.1.3.2

Multiply $x$ by $x^{4}$ by adding the exponents.

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Step 14.1.1.3.2.1

Move $x^{4}$ .

$\frac{x \cos (x^{4}) - 4 (x^{4} x) \sin (x^{4}) + 6 \cos (x^{4}) + 6 (- 4 x^{4} \sin (x^{4})) - \cos (x^{4}) x}{{(x + 6)}^{2}}$

Step 14.1.1.3.2.2

Multiply $x^{4}$ by $x$ .

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Step 14.1.1.3.2.2.1

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

$\frac{x \cos (x^{4}) - 4 (x^{4} x^{1}) \sin (x^{4}) + 6 \cos (x^{4}) + 6 (- 4 x^{4} \sin (x^{4})) - \cos (x^{4}) x}{{(x + 6)}^{2}}$

Step 14.1.1.3.2.2.2

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

$\frac{x \cos (x^{4}) - 4 x^{4 + 1} \sin (x^{4}) + 6 \cos (x^{4}) + 6 (- 4 x^{4} \sin (x^{4})) - \cos (x^{4}) x}{{(x + 6)}^{2}}$

Step 14.1.1.3.2.3

Add $4$ and $1$ .

$\frac{x \cos (x^{4}) - 4 x^{5} \sin (x^{4}) + 6 \cos (x^{4}) + 6 (- 4 x^{4} \sin (x^{4})) - \cos (x^{4}) x}{{(x + 6)}^{2}}$

Step 14.1.1.3.3

Multiply $- 4$ by $6$ .

$\frac{x \cos (x^{4}) - 4 x^{5} \sin (x^{4}) + 6 \cos (x^{4}) - 24 x^{4} \sin (x^{4}) - \cos (x^{4}) x}{{(x + 6)}^{2}}$

Step 14.1.2

Combine the opposite terms in $x \cos (x^{4}) - 4 x^{5} \sin (x^{4}) + 6 \cos (x^{4}) - 24 x^{4} \sin (x^{4}) - \cos (x^{4}) x$ .

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Step 14.1.2.1

Reorder the factors in the terms $x \cos (x^{4})$ and $- \cos (x^{4}) x$ .

$\frac{x \cos (x^{4}) - 4 x^{5} \sin (x^{4}) + 6 \cos (x^{4}) - 24 x^{4} \sin (x^{4}) - x \cos (x^{4})}{{(x + 6)}^{2}}$

Step 14.1.2.2

Subtract $x \cos (x^{4})$ from $x \cos (x^{4})$ .

$\frac{- 4 x^{5} \sin (x^{4}) + 6 \cos (x^{4}) - 24 x^{4} \sin (x^{4}) + 0}{{(x + 6)}^{2}}$

Step 14.1.2.3

Add $- 4 x^{5} \sin (x^{4}) + 6 \cos (x^{4}) - 24 x^{4} \sin (x^{4})$ and $0$ .

$\frac{- 4 x^{5} \sin (x^{4}) + 6 \cos (x^{4}) - 24 x^{4} \sin (x^{4})}{{(x + 6)}^{2}}$

Step 14.2

Reorder terms.

$\frac{- 4 x^{5} \sin (x^{4}) - 24 x^{4} \sin (x^{4}) + 6 \cos (x^{4})}{{(x + 6)}^{2}}$

Step 14.3

Factor $2$ out of $- 4 x^{5} \sin (x^{4}) - 24 x^{4} \sin (x^{4}) + 6 \cos (x^{4})$ .

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Step 14.3.1

Factor $2$ out of $- 4 x^{5} \sin (x^{4})$ .

$\frac{2 (- 2 x^{5} \sin (x^{4})) - 24 x^{4} \sin (x^{4}) + 6 \cos (x^{4})}{{(x + 6)}^{2}}$

Step 14.3.2

Factor $2$ out of $- 24 x^{4} \sin (x^{4})$ .

$\frac{2 (- 2 x^{5} \sin (x^{4})) + 2 (- 12 x^{4} \sin (x^{4})) + 6 \cos (x^{4})}{{(x + 6)}^{2}}$

Step 14.3.3

Factor $2$ out of $6 \cos (x^{4})$ .

$\frac{2 (- 2 x^{5} \sin (x^{4})) + 2 (- 12 x^{4} \sin (x^{4})) + 2 (3 \cos (x^{4}))}{{(x + 6)}^{2}}$

Step 14.3.4

Factor $2$ out of $2 (- 2 x^{5} \sin (x^{4})) + 2 (- 12 x^{4} \sin (x^{4}))$ .

$\frac{2 (- 2 x^{5} \sin (x^{4}) - 12 x^{4} \sin (x^{4})) + 2 (3 \cos (x^{4}))}{{(x + 6)}^{2}}$

Step 14.3.5

Factor $2$ out of $2 (- 2 x^{5} \sin (x^{4}) - 12 x^{4} \sin (x^{4})) + 2 (3 \cos (x^{4}))$ .

$\frac{2 (- 2 x^{5} \sin (x^{4}) - 12 x^{4} \sin (x^{4}) + 3 \cos (x^{4}))}{{(x + 6)}^{2}}$

Step 14.4

Factor $- 1$ out of $- 2 x^{5} \sin (x^{4})$ .

$\frac{2 (- (2 x^{5} \sin (x^{4})) - 12 x^{4} \sin (x^{4}) + 3 \cos (x^{4}))}{{(x + 6)}^{2}}$

Step 14.5

Factor $- 1$ out of $- 12 x^{4} \sin (x^{4})$ .

$\frac{2 (- (2 x^{5} \sin (x^{4})) - (12 x^{4} \sin (x^{4})) + 3 \cos (x^{4}))}{{(x + 6)}^{2}}$

Step 14.6

Factor $- 1$ out of $- (2 x^{5} \sin (x^{4})) - (12 x^{4} \sin (x^{4}))$ .

$\frac{2 (- (2 x^{5} \sin (x^{4}) + 12 x^{4} \sin (x^{4})) + 3 \cos (x^{4}))}{{(x + 6)}^{2}}$

Step 14.7

Factor $- 1$ out of $3 \cos (x^{4})$ .

$\frac{2 (- (2 x^{5} \sin (x^{4}) + 12 x^{4} \sin (x^{4})) - (- 3 \cos (x^{4})))}{{(x + 6)}^{2}}$

Step 14.8

Factor $- 1$ out of $- (2 x^{5} \sin (x^{4}) + 12 x^{4} \sin (x^{4})) - (- 3 \cos (x^{4}))$ .

$\frac{2 (- (2 x^{5} \sin (x^{4}) + 12 x^{4} \sin (x^{4}) - 3 \cos (x^{4})))}{{(x + 6)}^{2}}$

Step 14.9

Rewrite $- (2 x^{5} \sin (x^{4}) + 12 x^{4} \sin (x^{4}) - 3 \cos (x^{4}))$ as $- 1 (2 x^{5} \sin (x^{4}) + 12 x^{4} \sin (x^{4}) - 3 \cos (x^{4}))$ .

$\frac{2 (- 1 (2 x^{5} \sin (x^{4}) + 12 x^{4} \sin (x^{4}) - 3 \cos (x^{4})))}{{(x + 6)}^{2}}$

Step 14.10

Move the negative in front of the fraction.

$- \frac{2 (2 x^{5} \sin (x^{4}) + 12 x^{4} \sin (x^{4}) - 3 \cos (x^{4}))}{{(x + 6)}^{2}}$