Calculus Examples

$\frac{\sin (3 \sin (x))}{\sin (x)}$

Step 1

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 $f (x) = \sin (3 \sin (x))$ and $g (x) = \sin (x)$ .

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

Step 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 $g (x) = 3 \sin (x)$ .

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Step 2.1

To apply the Chain Rule, set $u$ as $3 \sin (x)$ .

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

Step 2.2

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

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

Step 2.3

Replace all occurrences of $u$ with $3 \sin (x)$ .

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

Step 3

Differentiate using the Constant Multiple Rule.

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Step 3.1

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

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

Step 3.2

Move $3$ to the left of $\cos (3 \sin (x))$ .

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

Step 4

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

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

Step 5

Reorder the factors of $3 \cos (3 \sin (x)) \cos (x)$ .

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

Step 6

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

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

Step 7

Simplify.

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Step 7.1

Rewrite using the commutative property of multiplication.

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

Step 7.2

Reorder terms.

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