Calculus Examples

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

Step 1

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 $g (x) = 2 x^{3} - \sin (x)$ .

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

Step 2

Differentiate.

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Step 2.1

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

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

Step 2.2

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

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

Step 2.3

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

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

Step 2.4

Multiply $3$ by $2$ .

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

Step 2.5

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

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

Step 3

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

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

Step 4

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

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

Step 5

Simplify.

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Step 5.1

Apply the distributive property.

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

Step 5.2

Apply the distributive property.

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

Step 5.3

Combine terms.

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Step 5.3.1

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

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

Step 5.3.2

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

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

Step 5.3.3

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

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

Step 5.3.4

Add $1$ and $1$ .

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

Step 5.3.5

Multiply $- 1$ by $2$ .

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

Step 5.3.6

Multiply $- 1$ by $- 1$ .

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

Step 5.3.7

Multiply $\sin (x)$ by $1$ .

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

Step 5.3.8

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

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

Step 5.3.9

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

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

Step 5.3.10

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

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

Step 5.3.11

Add $1$ and $1$ .

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

Step 5.4

Reorder terms.

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