Calculus Examples

$h (x) = \cos (\sin (5 x^{3})) - \tan^{3} (x^{2})$

Step 1

By the Sum Rule, the derivative of $\cos (\sin (5 x^{3})) - \tan^{3} (x^{2})$ with respect to $x$ is $\frac{d}{d x} [\cos (\sin (5 x^{3}))] + \frac{d}{d x} [- \tan^{3} (x^{2})]$ .

$\frac{d}{d x} [\cos (\sin (5 x^{3}))] + \frac{d}{d x} [- \tan^{3} (x^{2})]$

Step 2

Evaluate $\frac{d}{d x} [\cos (\sin (5 x^{3}))]$ .

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Step 2.1

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 $g (x) = \sin (5 x^{3})$ .

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Step 2.1.1

To apply the Chain Rule, set $u_{1}$ as $\sin (5 x^{3})$ .

$\frac{d}{d u_{1}} [\cos (u_{1})] \frac{d}{d x} [\sin (5 x^{3})] + \frac{d}{d x} [- \tan^{3} (x^{2})]$

Step 2.1.2

The derivative of $\cos (u_{1})$ with respect to $u_{1}$ is $- \sin (u_{1})$ .

$- \sin (u_{1}) \frac{d}{d x} [\sin (5 x^{3})] + \frac{d}{d x} [- \tan^{3} (x^{2})]$

Step 2.1.3

Replace all occurrences of $u_{1}$ with $\sin (5 x^{3})$ .

$- \sin (\sin (5 x^{3})) \frac{d}{d x} [\sin (5 x^{3})] + \frac{d}{d x} [- \tan^{3} (x^{2})]$

Step 2.2

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = \sin (x)$ and $g (x) = 5 x^{3}$ .

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Step 2.2.1

To apply the Chain Rule, set $u_{2}$ as $5 x^{3}$ .

$- \sin (\sin (5 x^{3})) (\frac{d}{d u_{2}} [\sin (u_{2})] \frac{d}{d x} [5 x^{3}]) + \frac{d}{d x} [- \tan^{3} (x^{2})]$

Step 2.2.2

The derivative of $\sin (u_{2})$ with respect to $u_{2}$ is $\cos (u_{2})$ .

$- \sin (\sin (5 x^{3})) (\cos (u_{2}) \frac{d}{d x} [5 x^{3}]) + \frac{d}{d x} [- \tan^{3} (x^{2})]$

Step 2.2.3

Replace all occurrences of $u_{2}$ with $5 x^{3}$ .

$- \sin (\sin (5 x^{3})) (\cos (5 x^{3}) \frac{d}{d x} [5 x^{3}]) + \frac{d}{d x} [- \tan^{3} (x^{2})]$

Step 2.3

Since $5$ is constant with respect to $x$ , the derivative of $5 x^{3}$ with respect to $x$ is $5 \frac{d}{d x} [x^{3}]$ .

$- \sin (\sin (5 x^{3})) (\cos (5 x^{3}) (5 \frac{d}{d x} [x^{3}])) + \frac{d}{d x} [- \tan^{3} (x^{2})]$

Step 2.4

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

$- \sin (\sin (5 x^{3})) (\cos (5 x^{3}) (5 (3 x^{2}))) + \frac{d}{d x} [- \tan^{3} (x^{2})]$

Step 2.5

Multiply $3$ by $5$ .

$- \sin (\sin (5 x^{3})) (\cos (5 x^{3}) (15 x^{2})) + \frac{d}{d x} [- \tan^{3} (x^{2})]$

Step 2.6

Multiply $15$ by $- 1$ .

$- 15 \sin (\sin (5 x^{3})) \cos (5 x^{3}) x^{2} + \frac{d}{d x} [- \tan^{3} (x^{2})]$

Step 3

Evaluate $\frac{d}{d x} [- \tan^{3} (x^{2})]$ .

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Step 3.1

Since $- 1$ is constant with respect to $x$ , the derivative of $- \tan^{3} (x^{2})$ with respect to $x$ is $- \frac{d}{d x} [\tan^{3} (x^{2})]$ .

$- 15 \sin (\sin (5 x^{3})) \cos (5 x^{3}) x^{2} - \frac{d}{d x} [\tan^{3} (x^{2})]$

Step 3.2

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{3}$ and $g (x) = \tan (x^{2})$ .

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Step 3.2.1

To apply the Chain Rule, set $u_{3}$ as $\tan (x^{2})$ .

$- 15 \sin (\sin (5 x^{3})) \cos (5 x^{3}) x^{2} - (\frac{d}{d u_{3}} [{u_{3}}^{3}] \frac{d}{d x} [\tan (x^{2})])$

Step 3.2.2

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

$- 15 \sin (\sin (5 x^{3})) \cos (5 x^{3}) x^{2} - (3 {u_{3}}^{2} \frac{d}{d x} [\tan (x^{2})])$

Step 3.2.3

Replace all occurrences of $u_{3}$ with $\tan (x^{2})$ .

$- 15 \sin (\sin (5 x^{3})) \cos (5 x^{3}) x^{2} - (3 \tan^{2} (x^{2}) \frac{d}{d x} [\tan (x^{2})])$

Step 3.3

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

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Step 3.3.1

To apply the Chain Rule, set $u_{4}$ as $x^{2}$ .

$- 15 \sin (\sin (5 x^{3})) \cos (5 x^{3}) x^{2} - (3 \tan^{2} (x^{2}) (\frac{d}{d u_{4}} [\tan (u_{4})] \frac{d}{d x} [x^{2}]))$

Step 3.3.2

The derivative of $\tan (u_{4})$ with respect to $u_{4}$ is $\sec^{2} (u_{4})$ .

$- 15 \sin (\sin (5 x^{3})) \cos (5 x^{3}) x^{2} - (3 \tan^{2} (x^{2}) (\sec^{2} (u_{4}) \frac{d}{d x} [x^{2}]))$

Step 3.3.3

Replace all occurrences of $u_{4}$ with $x^{2}$ .

$- 15 \sin (\sin (5 x^{3})) \cos (5 x^{3}) x^{2} - (3 \tan^{2} (x^{2}) (\sec^{2} (x^{2}) \frac{d}{d x} [x^{2}]))$

Step 3.4

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

$- 15 \sin (\sin (5 x^{3})) \cos (5 x^{3}) x^{2} - (3 \tan^{2} (x^{2}) (\sec^{2} (x^{2}) (2 x)))$

Step 3.5

Multiply $2$ by $3$ .

$- 15 \sin (\sin (5 x^{3})) \cos (5 x^{3}) x^{2} - (6 \tan^{2} (x^{2}) (\sec^{2} (x^{2}) (x)))$

Step 3.6

Multiply $6$ by $- 1$ .

$- 15 \sin (\sin (5 x^{3})) \cos (5 x^{3}) x^{2} - 6 \tan^{2} (x^{2}) \sec^{2} (x^{2}) x$

Step 4

Simplify.

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Step 4.1

Reorder terms.

$- 15 x^{2} \cos (5 x^{3}) \sin (\sin (5 x^{3})) - 6 x \sec^{2} (x^{2}) \tan^{2} (x^{2})$

Step 4.2

Simplify each term.

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Step 4.2.1

Rewrite $\sec (x^{2})$ in terms of sines and cosines.

$- 15 x^{2} \cos (5 x^{3}) \sin (\sin (5 x^{3})) - 6 x {(\frac{1}{\cos (x^{2})})}^{2} \tan^{2} (x^{2})$

Step 4.2.2

Apply the product rule to $\frac{1}{\cos (x^{2})}$ .

$- 15 x^{2} \cos (5 x^{3}) \sin (\sin (5 x^{3})) - 6 x \frac{1^{2}}{\cos^{2} (x^{2})} \tan^{2} (x^{2})$

Step 4.2.3

One to any power is one.

$- 15 x^{2} \cos (5 x^{3}) \sin (\sin (5 x^{3})) - 6 x \frac{1}{\cos^{2} (x^{2})} \tan^{2} (x^{2})$

Step 4.2.4

Multiply $- 6 x \frac{1}{\cos^{2} (x^{2})}$ .

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Step 4.2.4.1

Combine $- 6$ and $\frac{1}{\cos^{2} (x^{2})}$ .

$- 15 x^{2} \cos (5 x^{3}) \sin (\sin (5 x^{3})) + x \frac{- 6}{\cos^{2} (x^{2})} \tan^{2} (x^{2})$

Step 4.2.4.2

Combine $x$ and $\frac{- 6}{\cos^{2} (x^{2})}$ .

$- 15 x^{2} \cos (5 x^{3}) \sin (\sin (5 x^{3})) + \frac{x \cdot - 6}{\cos^{2} (x^{2})} \tan^{2} (x^{2})$

Step 4.2.5

Move $- 6$ to the left of $x$ .

$- 15 x^{2} \cos (5 x^{3}) \sin (\sin (5 x^{3})) + \frac{- 6 \cdot x}{\cos^{2} (x^{2})} \tan^{2} (x^{2})$

Step 4.2.6

Move the negative in front of the fraction.

$- 15 x^{2} \cos (5 x^{3}) \sin (\sin (5 x^{3})) - \frac{6 \cdot x}{\cos^{2} (x^{2})} \tan^{2} (x^{2})$

Step 4.2.7

Rewrite $\tan (x^{2})$ in terms of sines and cosines.

$- 15 x^{2} \cos (5 x^{3}) \sin (\sin (5 x^{3})) - \frac{6 x}{\cos^{2} (x^{2})} {(\frac{\sin (x^{2})}{\cos (x^{2})})}^{2}$

Step 4.2.8

Apply the product rule to $\frac{\sin (x^{2})}{\cos (x^{2})}$ .

$- 15 x^{2} \cos (5 x^{3}) \sin (\sin (5 x^{3})) - \frac{6 x}{\cos^{2} (x^{2})} \cdot \frac{\sin^{2} (x^{2})}{\cos^{2} (x^{2})}$

Step 4.2.9

Multiply $- \frac{6 x}{\cos^{2} (x^{2})} \cdot \frac{\sin^{2} (x^{2})}{\cos^{2} (x^{2})}$ .

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Step 4.2.9.1

Multiply $\frac{\sin^{2} (x^{2})}{\cos^{2} (x^{2})}$ by $\frac{6 x}{\cos^{2} (x^{2})}$ .

$- 15 x^{2} \cos (5 x^{3}) \sin (\sin (5 x^{3})) - \frac{\sin^{2} (x^{2}) (6 x)}{\cos^{2} (x^{2}) \cos^{2} (x^{2})}$

Step 4.2.9.2

Multiply $\cos^{2} (x^{2})$ by $\cos^{2} (x^{2})$ by adding the exponents.

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Step 4.2.9.2.1

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

$- 15 x^{2} \cos (5 x^{3}) \sin (\sin (5 x^{3})) - \frac{\sin^{2} (x^{2}) (6 x)}{{\cos (x^{2})}^{2 + 2}}$

Step 4.2.9.2.2

Add $2$ and $2$ .

$- 15 x^{2} \cos (5 x^{3}) \sin (\sin (5 x^{3})) - \frac{\sin^{2} (x^{2}) (6 x)}{\cos^{4} (x^{2})}$

Step 4.2.10

Move $6$ to the left of $\sin^{2} (x^{2})$ .

$- 15 x^{2} \cos (5 x^{3}) \sin (\sin (5 x^{3})) - \frac{6 \sin^{2} (x^{2}) x}{\cos^{4} (x^{2})}$

Step 4.3

Simplify each term.

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Step 4.3.1

Multiply by $1$ .

$- 15 x^{2} \cos (5 x^{3}) \sin (\sin (5 x^{3})) - \frac{6 (\sin^{2} (x^{2}) \cdot 1) x}{\cos^{4} (x^{2})}$

Step 4.3.2

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

$- 15 x^{2} \cos (5 x^{3}) \sin (\sin (5 x^{3})) - \frac{6 (\sin^{2} (x^{2}) \cdot 1) x}{\cos^{2} (x^{2}) \cos^{2} (x^{2})}$

Step 4.3.3

Separate fractions.

$- 15 x^{2} \cos (5 x^{3}) \sin (\sin (5 x^{3})) - (\frac{6 \cdot (1) x}{\cos^{2} (x^{2})} \cdot \frac{\sin^{2} (x^{2})}{\cos^{2} (x^{2})})$

Step 4.3.4

Convert from $\frac{\sin^{2} (x^{2})}{\cos^{2} (x^{2})}$ to $\tan^{2} (x^{2})$ .

$- 15 x^{2} \cos (5 x^{3}) \sin (\sin (5 x^{3})) - (\frac{6 \cdot (1) x}{\cos^{2} (x^{2})} \tan^{2} (x^{2}))$

Step 4.3.5

Multiply $6$ by $1$ .

$- 15 x^{2} \cos (5 x^{3}) \sin (\sin (5 x^{3})) - (\frac{6 x}{\cos^{2} (x^{2})} \tan^{2} (x^{2}))$

Step 4.3.6

Combine $\frac{6 x}{\cos^{2} (x^{2})}$ and $\tan^{2} (x^{2})$ .

$- 15 x^{2} \cos (5 x^{3}) \sin (\sin (5 x^{3})) - \frac{6 x \tan^{2} (x^{2})}{\cos^{2} (x^{2})}$

Step 4.3.7

Multiply by $1$ .

$- 15 x^{2} \cos (5 x^{3}) \sin (\sin (5 x^{3})) - \frac{6 x \tan^{2} (x^{2})}{\cos^{2} (x^{2}) \cdot 1}$

Step 4.3.8

Separate fractions.

$- 15 x^{2} \cos (5 x^{3}) \sin (\sin (5 x^{3})) - (\frac{6 x}{1} \cdot \frac{\tan^{2} (x^{2})}{\cos^{2} (x^{2})})$

Step 4.3.9

Convert from $\frac{1}{\cos^{2} (x^{2})}$ to $\sec^{2} (x^{2})$ .

$- 15 x^{2} \cos (5 x^{3}) \sin (\sin (5 x^{3})) - (\frac{6 x}{1} (\tan^{2} (x^{2}) \sec^{2} (x^{2})))$

Step 4.3.10

Divide $6 x$ by $1$ .

$- 15 x^{2} \cos (5 x^{3}) \sin (\sin (5 x^{3})) - (6 x (\tan^{2} (x^{2}) \sec^{2} (x^{2})))$

Step 4.3.11

Multiply $6$ by $- 1$ .

$- 15 x^{2} \cos (5 x^{3}) \sin (\sin (5 x^{3})) - 6 x (\tan^{2} (x^{2}) \sec^{2} (x^{2}))$

$- 15 x^{2} \cos (5 x^{3}) \sin (\sin (5 x^{3})) - 6 x \tan^{2} (x^{2}) \sec^{2} (x^{2})$