Calculus Examples

$y = {(2 x^{3} + 2)}^{4} \cos^{3} (x)$

Step 1

Differentiate both sides of the equation.

$\frac{d}{d x} (y) = \frac{d}{d x} ({(2 x^{3} + 2)}^{4} \cos^{3} (x))$

Step 2

The derivative of $y$ with respect to $x$ is $y'$ .

$y'$

Step 3

Differentiate the right side of the equation.

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Step 3.1

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 $f (x) = {(2 x^{3} + 2)}^{4}$ and $g (x) = \cos^{3} (x)$ .

${(2 x^{3} + 2)}^{4} \frac{d}{d x} [\cos^{3} (x)] + \cos^{3} (x) \frac{d}{d x} [{(2 x^{3} + 2)}^{4}]$

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 $g (x) = \cos (x)$ .

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Step 3.2.1

To apply the Chain Rule, set $u_{1}$ as $\cos (x)$ .

${(2 x^{3} + 2)}^{4} (\frac{d}{d u_{1}} [{u_{1}}^{3}] \frac{d}{d x} [\cos (x)]) + \cos^{3} (x) \frac{d}{d x} [{(2 x^{3} + 2)}^{4}]$

Step 3.2.2

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

${(2 x^{3} + 2)}^{4} (3 {u_{1}}^{2} \frac{d}{d x} [\cos (x)]) + \cos^{3} (x) \frac{d}{d x} [{(2 x^{3} + 2)}^{4}]$

Step 3.2.3

Replace all occurrences of $u_{1}$ with $\cos (x)$ .

${(2 x^{3} + 2)}^{4} (3 \cos^{2} (x) \frac{d}{d x} [\cos (x)]) + \cos^{3} (x) \frac{d}{d x} [{(2 x^{3} + 2)}^{4}]$

Step 3.3

Move $3$ to the left of ${(2 x^{3} + 2)}^{4}$ .

$3 \cdot {(2 x^{3} + 2)}^{4} \cos^{2} (x) \frac{d}{d x} [\cos (x)] + \cos^{3} (x) \frac{d}{d x} [{(2 x^{3} + 2)}^{4}]$

Step 3.4

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

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

Step 3.5

Multiply $- 1$ by $3$ .

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

Step 3.6

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{4}$ and $g (x) = 2 x^{3} + 2$ .

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Step 3.6.1

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

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

Step 3.6.2

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

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

Step 3.6.3

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

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

Step 3.7

Differentiate.

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Step 3.7.1

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

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

Step 3.7.2

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

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

Step 3.7.3

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

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

Step 3.7.4

Multiply $3$ by $2$ .

$- 3 {(2 x^{3} + 2)}^{4} \cos^{2} (x) \sin (x) + \cos^{3} (x) (4 {(2 x^{3} + 2)}^{3} (6 x^{2} + \frac{d}{d x} [2]))$

Step 3.7.5

Since $2$ is constant with respect to $x$ , the derivative of $2$ with respect to $x$ is $0$ .

$- 3 {(2 x^{3} + 2)}^{4} \cos^{2} (x) \sin (x) + \cos^{3} (x) (4 {(2 x^{3} + 2)}^{3} (6 x^{2} + 0))$

Step 3.7.6

Simplify the expression.

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Step 3.7.6.1

Add $6 x^{2}$ and $0$ .

$- 3 {(2 x^{3} + 2)}^{4} \cos^{2} (x) \sin (x) + \cos^{3} (x) (4 {(2 x^{3} + 2)}^{3} (6 x^{2}))$

Step 3.7.6.2

Multiply $6$ by $4$ .

$- 3 {(2 x^{3} + 2)}^{4} \cos^{2} (x) \sin (x) + \cos^{3} (x) (24 {(2 x^{3} + 2)}^{3} x^{2})$

Step 3.7.6.3

Reorder terms.

$- 3 \cos^{2} (x) {(2 x^{3} + 2)}^{4} \sin (x) + 24 x^{2} \cos^{3} (x) {(2 x^{3} + 2)}^{3}$

Step 4

Reform the equation by setting the left side equal to the right side.

$y' = - 3 \cos^{2} (x) {(2 x^{3} + 2)}^{4} \sin (x) + 24 x^{2} \cos^{3} (x) {(2 x^{3} + 2)}^{3}$

Step 5

Replace $y'$ with $\frac{d y}{d x}$ .

$\frac{d y}{d x} = - 3 \cos^{2} (x) {(2 x^{3} + 2)}^{4} \sin (x) + 24 x^{2} \cos^{3} (x) {(2 x^{3} + 2)}^{3}$