Calculus Examples

$- 2 \cos (x) \sin (x)$

Step 1

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

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

Step 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 $f (x) = \cos (x)$ and $g (x) = \sin (x)$ .

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

Step 3

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

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

Step 4

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

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

Step 5

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

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

Step 6

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

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

Step 7

Add $1$ and $1$ .

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

Step 8

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

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

Step 9

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

$- 2 (\cos^{2} (x) - (\sin^{1} (x) \sin (x)))$

Step 10

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

$- 2 (\cos^{2} (x) - (\sin^{1} (x) \sin^{1} (x)))$

Step 11

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

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

Step 12

Add $1$ and $1$ .

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

Step 13

Simplify.

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Step 13.1

Apply the distributive property.

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

Step 13.2

Multiply $- 1$ by $- 2$ .

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