Calculus Examples

$y = 4 \tan (2 x) - \sin^{3} (5 x)$

Step 1

Find the first derivative.

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Step 1.1

By the Sum Rule, the derivative of $4 \tan (2 x) - \sin^{3} (5 x)$ with respect to $x$ is $\frac{d}{d x} [4 \tan (2 x)] + \frac{d}{d x} [- \sin^{3} (5 x)]$ .

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

Step 1.2

Evaluate $\frac{d}{d x} [4 \tan (2 x)]$ .

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Step 1.2.1

Since $4$ is constant with respect to $x$ , the derivative of $4 \tan (2 x)$ with respect to $x$ is $4 \frac{d}{d x} [\tan (2 x)]$ .

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

Step 1.2.2

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

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Step 1.2.2.1

To apply the Chain Rule, set $u_{1}$ as $2 x$ .

$4 (\frac{d}{d u_{1}} [\tan (u_{1})] \frac{d}{d x} [2 x]) + \frac{d}{d x} [- \sin^{3} (5 x)]$

Step 1.2.2.2

The derivative of $\tan (u_{1})$ with respect to $u_{1}$ is $\sec^{2} (u_{1})$ .

$4 (\sec^{2} (u_{1}) \frac{d}{d x} [2 x]) + \frac{d}{d x} [- \sin^{3} (5 x)]$

Step 1.2.2.3

Replace all occurrences of $u_{1}$ with $2 x$ .

$4 (\sec^{2} (2 x) \frac{d}{d x} [2 x]) + \frac{d}{d x} [- \sin^{3} (5 x)]$

Step 1.2.3

Since $2$ is constant with respect to $x$ , the derivative of $2 x$ with respect to $x$ is $2 \frac{d}{d x} [x]$ .

$4 (\sec^{2} (2 x) (2 \frac{d}{d x} [x])) + \frac{d}{d x} [- \sin^{3} (5 x)]$

Step 1.2.4

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

$4 (\sec^{2} (2 x) (2 \cdot 1)) + \frac{d}{d x} [- \sin^{3} (5 x)]$

Step 1.2.5

Multiply $2$ by $1$ .

$4 (\sec^{2} (2 x) \cdot 2) + \frac{d}{d x} [- \sin^{3} (5 x)]$

Step 1.2.6

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

$4 (2 \cdot \sec^{2} (2 x)) + \frac{d}{d x} [- \sin^{3} (5 x)]$

Step 1.2.7

Multiply $2$ by $4$ .

$8 \sec^{2} (2 x) + \frac{d}{d x} [- \sin^{3} (5 x)]$

Step 1.3

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

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Step 1.3.1

Since $- 1$ is constant with respect to $x$ , the derivative of $- \sin^{3} (5 x)$ with respect to $x$ is $- \frac{d}{d x} [\sin^{3} (5 x)]$ .

$8 \sec^{2} (2 x) - \frac{d}{d x} [\sin^{3} (5 x)]$

Step 1.3.2

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 $g (x) = \sin (5 x)$ .

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Step 1.3.2.1

To apply the Chain Rule, set $u_{2}$ as $\sin (5 x)$ .

$8 \sec^{2} (2 x) - (\frac{d}{d u_{2}} [{u_{2}}^{3}] \frac{d}{d x} [\sin (5 x)])$

Step 1.3.2.2

Differentiate using the Power Rule which states that $\frac{d}{d u_{2}} [{u_{2}}^{n}]$ is $n {u_{2}}^{n - 1}$ where $n = 3$ .

$8 \sec^{2} (2 x) - (3 {u_{2}}^{2} \frac{d}{d x} [\sin (5 x)])$

Step 1.3.2.3

Replace all occurrences of $u_{2}$ with $\sin (5 x)$ .

$8 \sec^{2} (2 x) - (3 \sin^{2} (5 x) \frac{d}{d x} [\sin (5 x)])$

Step 1.3.3

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

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Step 1.3.3.1

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

$8 \sec^{2} (2 x) - (3 \sin^{2} (5 x) (\frac{d}{d u_{3}} [\sin (u_{3})] \frac{d}{d x} [5 x]))$

Step 1.3.3.2

The derivative of $\sin (u_{3})$ with respect to $u_{3}$ is $\cos (u_{3})$ .

$8 \sec^{2} (2 x) - (3 \sin^{2} (5 x) (\cos (u_{3}) \frac{d}{d x} [5 x]))$

Step 1.3.3.3

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

$8 \sec^{2} (2 x) - (3 \sin^{2} (5 x) (\cos (5 x) \frac{d}{d x} [5 x]))$

Step 1.3.4

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

$8 \sec^{2} (2 x) - (3 \sin^{2} (5 x) (\cos (5 x) (5 \frac{d}{d x} [x])))$

Step 1.3.5

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

$8 \sec^{2} (2 x) - (3 \sin^{2} (5 x) (\cos (5 x) (5 \cdot 1)))$

Step 1.3.6

Multiply $5$ by $1$ .

$8 \sec^{2} (2 x) - (3 \sin^{2} (5 x) (\cos (5 x) \cdot 5))$

Step 1.3.7

Move $5$ to the left of $\cos (5 x)$ .

$8 \sec^{2} (2 x) - (3 \sin^{2} (5 x) (5 \cdot \cos (5 x)))$

Step 1.3.8

Multiply $5$ by $3$ .

$8 \sec^{2} (2 x) - (15 \sin^{2} (5 x) \cos (5 x))$

Step 1.3.9

Multiply $15$ by $- 1$ .

$8 \sec^{2} (2 x) - 15 \sin^{2} (5 x) \cos (5 x)$

Step 1.4

Reorder terms.

$f' (x) = - 15 \sin^{2} (5 x) \cos (5 x) + 8 \sec^{2} (2 x)$

Step 2

Find the second derivative.

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Step 2.1

By the Sum Rule, the derivative of $- 15 \sin^{2} (5 x) \cos (5 x) + 8 \sec^{2} (2 x)$ with respect to $x$ is $\frac{d}{d x} [- 15 \sin^{2} (5 x) \cos (5 x)] + \frac{d}{d x} [8 \sec^{2} (2 x)]$ .

$\frac{d}{d x} [- 15 \sin^{2} (5 x) \cos (5 x)] + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2

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

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Step 2.2.1

Since $- 15$ is constant with respect to $x$ , the derivative of $- 15 \sin^{2} (5 x) \cos (5 x)$ with respect to $x$ is $- 15 \frac{d}{d x} [\sin^{2} (5 x) \cos (5 x)]$ .

$- 15 \frac{d}{d x} [\sin^{2} (5 x) \cos (5 x)] + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2.2

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 $f (x) = \sin^{2} (5 x)$ and $g (x) = \cos (5 x)$ .

$- 15 (\sin^{2} (5 x) \frac{d}{d x} [\cos (5 x)] + \cos (5 x) \frac{d}{d x} [\sin^{2} (5 x)]) + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2.3

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

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Step 2.2.3.1

To apply the Chain Rule, set $u_{1}$ as $5 x$ .

$- 15 (\sin^{2} (5 x) (\frac{d}{d u_{1}} [\cos (u_{1})] \frac{d}{d x} [5 x]) + \cos (5 x) \frac{d}{d x} [\sin^{2} (5 x)]) + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2.3.2

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

$- 15 (\sin^{2} (5 x) (- \sin (u_{1}) \frac{d}{d x} [5 x]) + \cos (5 x) \frac{d}{d x} [\sin^{2} (5 x)]) + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2.3.3

Replace all occurrences of $u_{1}$ with $5 x$ .

$- 15 (\sin^{2} (5 x) (- \sin (5 x) \frac{d}{d x} [5 x]) + \cos (5 x) \frac{d}{d x} [\sin^{2} (5 x)]) + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2.4

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

$- 15 (\sin^{2} (5 x) (- \sin (5 x) (5 \frac{d}{d x} [x])) + \cos (5 x) \frac{d}{d x} [\sin^{2} (5 x)]) + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2.5

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

$- 15 (\sin^{2} (5 x) (- \sin (5 x) (5 \cdot 1)) + \cos (5 x) \frac{d}{d x} [\sin^{2} (5 x)]) + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2.6

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{2}$ and $g (x) = \sin (5 x)$ .

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Step 2.2.6.1

To apply the Chain Rule, set $u_{2}$ as $\sin (5 x)$ .

$- 15 (\sin^{2} (5 x) (- \sin (5 x) (5 \cdot 1)) + \cos (5 x) (\frac{d}{d u_{2}} [{u_{2}}^{2}] \frac{d}{d x} [\sin (5 x)])) + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2.6.2

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

$- 15 (\sin^{2} (5 x) (- \sin (5 x) (5 \cdot 1)) + \cos (5 x) (2 u_{2} \frac{d}{d x} [\sin (5 x)])) + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2.6.3

Replace all occurrences of $u_{2}$ with $\sin (5 x)$ .

$- 15 (\sin^{2} (5 x) (- \sin (5 x) (5 \cdot 1)) + \cos (5 x) (2 \sin (5 x) \frac{d}{d x} [\sin (5 x)])) + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2.7

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 $g (x) = 5 x$ .

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Step 2.2.7.1

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

$- 15 (\sin^{2} (5 x) (- \sin (5 x) (5 \cdot 1)) + \cos (5 x) (2 \sin (5 x) (\frac{d}{d u_{3}} [\sin (u_{3})] \frac{d}{d x} [5 x]))) + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2.7.2

The derivative of $\sin (u_{3})$ with respect to $u_{3}$ is $\cos (u_{3})$ .

$- 15 (\sin^{2} (5 x) (- \sin (5 x) (5 \cdot 1)) + \cos (5 x) (2 \sin (5 x) (\cos (u_{3}) \frac{d}{d x} [5 x]))) + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2.7.3

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

$- 15 (\sin^{2} (5 x) (- \sin (5 x) (5 \cdot 1)) + \cos (5 x) (2 \sin (5 x) (\cos (5 x) \frac{d}{d x} [5 x]))) + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2.8

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

$- 15 (\sin^{2} (5 x) (- \sin (5 x) (5 \cdot 1)) + \cos (5 x) (2 \sin (5 x) (\cos (5 x) (5 \frac{d}{d x} [x])))) + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2.9

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

$- 15 (\sin^{2} (5 x) (- \sin (5 x) (5 \cdot 1)) + \cos (5 x) (2 \sin (5 x) (\cos (5 x) (5 \cdot 1)))) + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2.10

Multiply $5$ by $1$ .

$- 15 (\sin^{2} (5 x) (- \sin (5 x) \cdot 5) + \cos (5 x) (2 \sin (5 x) (\cos (5 x) (5 \cdot 1)))) + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2.11

Multiply $5$ by $- 1$ .

$- 15 (\sin^{2} (5 x) (- 5 \sin (5 x)) + \cos (5 x) (2 \sin (5 x) (\cos (5 x) (5 \cdot 1)))) + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2.12

Multiply $\sin^{2} (5 x)$ by $\sin (5 x)$ by adding the exponents.

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Step 2.2.12.1

Move $\sin (5 x)$ .

$- 15 (\sin (5 x) \sin^{2} (5 x) \cdot - 5 + \cos (5 x) (2 \sin (5 x) (\cos (5 x) (5 \cdot 1)))) + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2.12.2

Multiply $\sin (5 x)$ by $\sin^{2} (5 x)$ .

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Step 2.2.12.2.1

Raise $\sin (5 x)$ to the power of $1$ .

$- 15 (\sin^{1} (5 x) \sin^{2} (5 x) \cdot - 5 + \cos (5 x) (2 \sin (5 x) (\cos (5 x) (5 \cdot 1)))) + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2.12.2.2

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

$- 15 ({\sin (5 x)}^{1 + 2} \cdot - 5 + \cos (5 x) (2 \sin (5 x) (\cos (5 x) (5 \cdot 1)))) + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2.12.3

Add $1$ and $2$ .

$- 15 (\sin^{3} (5 x) \cdot - 5 + \cos (5 x) (2 \sin (5 x) (\cos (5 x) (5 \cdot 1)))) + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2.13

Move $- 5$ to the left of $\sin^{3} (5 x)$ .

$- 15 (- 5 \cdot \sin^{3} (5 x) + \cos (5 x) (2 \sin (5 x) (\cos (5 x) (5 \cdot 1)))) + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2.14

Multiply $5$ by $1$ .

$- 15 (- 5 \sin^{3} (5 x) + \cos (5 x) (2 \sin (5 x) (\cos (5 x) \cdot 5))) + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2.15

Move $5$ to the left of $\cos (5 x)$ .

$- 15 (- 5 \sin^{3} (5 x) + \cos (5 x) (2 \sin (5 x) (5 \cdot \cos (5 x)))) + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2.16

Multiply $5$ by $2$ .

$- 15 (- 5 \sin^{3} (5 x) + \cos (5 x) (10 \sin (5 x) \cos (5 x))) + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2.17

Raise $\cos (5 x)$ to the power of $1$ .

$- 15 (- 5 \sin^{3} (5 x) + 10 \sin (5 x) (\cos^{1} (5 x) \cos (5 x))) + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2.18

Raise $\cos (5 x)$ to the power of $1$ .

$- 15 (- 5 \sin^{3} (5 x) + 10 \sin (5 x) (\cos^{1} (5 x) \cos^{1} (5 x))) + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2.19

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

$- 15 (- 5 \sin^{3} (5 x) + 10 \sin (5 x) {\cos (5 x)}^{1 + 1}) + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.2.20

Add $1$ and $1$ .

$- 15 (- 5 \sin^{3} (5 x) + 10 \sin (5 x) \cos^{2} (5 x)) + \frac{d}{d x} [8 \sec^{2} (2 x)]$

Step 2.3

Evaluate $\frac{d}{d x} [8 \sec^{2} (2 x)]$ .

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Step 2.3.1

Since $8$ is constant with respect to $x$ , the derivative of $8 \sec^{2} (2 x)$ with respect to $x$ is $8 \frac{d}{d x} [\sec^{2} (2 x)]$ .

$- 15 (- 5 \sin^{3} (5 x) + 10 \sin (5 x) \cos^{2} (5 x)) + 8 \frac{d}{d x} [\sec^{2} (2 x)]$

Step 2.3.2

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

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Step 2.3.2.1

To apply the Chain Rule, set $u_{4}$ as $\sec (2 x)$ .

$- 15 (- 5 \sin^{3} (5 x) + 10 \sin (5 x) \cos^{2} (5 x)) + 8 (\frac{d}{d u_{4}} [{u_{4}}^{2}] \frac{d}{d x} [\sec (2 x)])$

Step 2.3.2.2

Differentiate using the Power Rule which states that $\frac{d}{d u_{4}} [{u_{4}}^{n}]$ is $n {u_{4}}^{n - 1}$ where $n = 2$ .

$- 15 (- 5 \sin^{3} (5 x) + 10 \sin (5 x) \cos^{2} (5 x)) + 8 (2 u_{4} \frac{d}{d x} [\sec (2 x)])$

Step 2.3.2.3

Replace all occurrences of $u_{4}$ with $\sec (2 x)$ .

$- 15 (- 5 \sin^{3} (5 x) + 10 \sin (5 x) \cos^{2} (5 x)) + 8 (2 \sec (2 x) \frac{d}{d x} [\sec (2 x)])$

Step 2.3.3

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

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Step 2.3.3.1

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

$- 15 (- 5 \sin^{3} (5 x) + 10 \sin (5 x) \cos^{2} (5 x)) + 8 (2 \sec (2 x) (\frac{d}{d u_{5}} [\sec (u_{5})] \frac{d}{d x} [2 x]))$

Step 2.3.3.2

The derivative of $\sec (u_{5})$ with respect to $u_{5}$ is $\sec (u_{5}) \tan (u_{5})$ .

$- 15 (- 5 \sin^{3} (5 x) + 10 \sin (5 x) \cos^{2} (5 x)) + 8 (2 \sec (2 x) (\sec (u_{5}) \tan (u_{5}) \frac{d}{d x} [2 x]))$

Step 2.3.3.3

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

$- 15 (- 5 \sin^{3} (5 x) + 10 \sin (5 x) \cos^{2} (5 x)) + 8 (2 \sec (2 x) (\sec (2 x) \tan (2 x) \frac{d}{d x} [2 x]))$

Step 2.3.4

Since $2$ is constant with respect to $x$ , the derivative of $2 x$ with respect to $x$ is $2 \frac{d}{d x} [x]$ .

$- 15 (- 5 \sin^{3} (5 x) + 10 \sin (5 x) \cos^{2} (5 x)) + 8 (2 \sec (2 x) (\sec (2 x) \tan (2 x) (2 \frac{d}{d x} [x])))$

Step 2.3.5

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

$- 15 (- 5 \sin^{3} (5 x) + 10 \sin (5 x) \cos^{2} (5 x)) + 8 (2 \sec (2 x) (\sec (2 x) \tan (2 x) (2 \cdot 1)))$

Step 2.3.6

Multiply $2$ by $1$ .

$- 15 (- 5 \sin^{3} (5 x) + 10 \sin (5 x) \cos^{2} (5 x)) + 8 (2 \sec (2 x) (\sec (2 x) \tan (2 x) \cdot 2))$

Step 2.3.7

Move $2$ to the left of $\sec (2 x) \tan (2 x)$ .

$- 15 (- 5 \sin^{3} (5 x) + 10 \sin (5 x) \cos^{2} (5 x)) + 8 (2 \sec (2 x) (2 \cdot (\sec (2 x) \tan (2 x))))$

Step 2.3.8

Multiply $2$ by $2$ .

$- 15 (- 5 \sin^{3} (5 x) + 10 \sin (5 x) \cos^{2} (5 x)) + 8 (4 \sec (2 x) (\sec (2 x) \tan (2 x)))$

Step 2.3.9

Raise $\sec (2 x)$ to the power of $1$ .

$- 15 (- 5 \sin^{3} (5 x) + 10 \sin (5 x) \cos^{2} (5 x)) + 8 (4 (\sec^{1} (2 x) \sec (2 x)) \tan (2 x))$

Step 2.3.10

Raise $\sec (2 x)$ to the power of $1$ .

$- 15 (- 5 \sin^{3} (5 x) + 10 \sin (5 x) \cos^{2} (5 x)) + 8 (4 (\sec^{1} (2 x) \sec^{1} (2 x)) \tan (2 x))$

Step 2.3.11

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

$- 15 (- 5 \sin^{3} (5 x) + 10 \sin (5 x) \cos^{2} (5 x)) + 8 (4 {\sec (2 x)}^{1 + 1} \tan (2 x))$

Step 2.3.12

Add $1$ and $1$ .

$- 15 (- 5 \sin^{3} (5 x) + 10 \sin (5 x) \cos^{2} (5 x)) + 8 (4 \sec^{2} (2 x) \tan (2 x))$

Step 2.3.13

Multiply $4$ by $8$ .

$- 15 (- 5 \sin^{3} (5 x) + 10 \sin (5 x) \cos^{2} (5 x)) + 32 \sec^{2} (2 x) \tan (2 x)$

Step 2.4

Simplify.

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Step 2.4.1

Apply the distributive property.

$- 15 (- 5 \sin^{3} (5 x)) - 15 (10 \sin (5 x) \cos^{2} (5 x)) + 32 \sec^{2} (2 x) \tan (2 x)$

Step 2.4.2

Combine terms.

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Step 2.4.2.1

Multiply $- 5$ by $- 15$ .

$75 \sin^{3} (5 x) - 15 (10 \sin (5 x) \cos^{2} (5 x)) + 32 \sec^{2} (2 x) \tan (2 x)$

Step 2.4.2.2

Multiply $10$ by $- 15$ .

$75 \sin^{3} (5 x) - 150 \sin (5 x) \cos^{2} (5 x) + 32 \sec^{2} (2 x) \tan (2 x)$

Step 2.4.3

Reorder terms.

$- 150 \cos^{2} (5 x) \sin (5 x) + 32 \sec^{2} (2 x) \tan (2 x) + 75 \sin^{3} (5 x)$

Step 2.4.4

Simplify each term.

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Step 2.4.4.1

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

$- 150 \cos^{2} (5 x) \sin (5 x) + 32 {(\frac{1}{\cos (2 x)})}^{2} \tan (2 x) + 75 \sin^{3} (5 x)$

Step 2.4.4.2

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

$- 150 \cos^{2} (5 x) \sin (5 x) + 32 \frac{1^{2}}{\cos^{2} (2 x)} \tan (2 x) + 75 \sin^{3} (5 x)$

Step 2.4.4.3

One to any power is one.

$- 150 \cos^{2} (5 x) \sin (5 x) + 32 \frac{1}{\cos^{2} (2 x)} \tan (2 x) + 75 \sin^{3} (5 x)$

Step 2.4.4.4

Combine $32$ and $\frac{1}{\cos^{2} (2 x)}$ .

$- 150 \cos^{2} (5 x) \sin (5 x) + \frac{32}{\cos^{2} (2 x)} \tan (2 x) + 75 \sin^{3} (5 x)$

Step 2.4.4.5

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

$- 150 \cos^{2} (5 x) \sin (5 x) + \frac{32}{\cos^{2} (2 x)} \cdot \frac{\sin (2 x)}{\cos (2 x)} + 75 \sin^{3} (5 x)$

Step 2.4.4.6

Combine.

$- 150 \cos^{2} (5 x) \sin (5 x) + \frac{32 \sin (2 x)}{\cos^{2} (2 x) \cos (2 x)} + 75 \sin^{3} (5 x)$

Step 2.4.4.7

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

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Step 2.4.4.7.1

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

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Step 2.4.4.7.1.1

Raise $\cos (2 x)$ to the power of $1$ .

$- 150 \cos^{2} (5 x) \sin (5 x) + \frac{32 \sin (2 x)}{\cos^{2} (2 x) \cos^{1} (2 x)} + 75 \sin^{3} (5 x)$

Step 2.4.4.7.1.2

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

$- 150 \cos^{2} (5 x) \sin (5 x) + \frac{32 \sin (2 x)}{{\cos (2 x)}^{2 + 1}} + 75 \sin^{3} (5 x)$

Step 2.4.4.7.2

Add $2$ and $1$ .

$- 150 \cos^{2} (5 x) \sin (5 x) + \frac{32 \sin (2 x)}{\cos^{3} (2 x)} + 75 \sin^{3} (5 x)$

Step 2.4.5

Simplify each term.

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Step 2.4.5.1

Factor $\cos (2 x)$ out of $\cos^{3} (2 x)$ .

$- 150 \cos^{2} (5 x) \sin (5 x) + \frac{32 \sin (2 x)}{\cos (2 x) \cos^{2} (2 x)} + 75 \sin^{3} (5 x)$

Step 2.4.5.2

Separate fractions.

$- 150 \cos^{2} (5 x) \sin (5 x) + \frac{32}{\cos^{2} (2 x)} \cdot \frac{\sin (2 x)}{\cos (2 x)} + 75 \sin^{3} (5 x)$

Step 2.4.5.3

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

$- 150 \cos^{2} (5 x) \sin (5 x) + \frac{32}{\cos^{2} (2 x)} \tan (2 x) + 75 \sin^{3} (5 x)$

Step 2.4.5.4

Multiply by $1$ .

$- 150 \cos^{2} (5 x) \sin (5 x) + \frac{32}{\cos^{2} (2 x) \cdot 1} \tan (2 x) + 75 \sin^{3} (5 x)$

Step 2.4.5.5

Separate fractions.

$- 150 \cos^{2} (5 x) \sin (5 x) + \frac{32}{1} \cdot \frac{1}{\cos^{2} (2 x)} \tan (2 x) + 75 \sin^{3} (5 x)$

Step 2.4.5.6

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

$- 150 \cos^{2} (5 x) \sin (5 x) + \frac{32}{1} \sec^{2} (2 x) \tan (2 x) + 75 \sin^{3} (5 x)$

Step 2.4.5.7

Divide $32$ by $1$ .

$f'' (x) = - 150 \cos^{2} (5 x) \sin (5 x) + 32 \sec^{2} (2 x) \tan (2 x) + 75 \sin^{3} (5 x)$