Calculus Examples

$f (x) = 2 x^{3} + 6 x - \frac{1}{x} + 3 e^{x} - \sin (x)$

Step 1

By the Sum Rule, the derivative of $2 x^{3} + 6 x - \frac{1}{x} + 3 e^{x} - \sin (x)$ with respect to $x$ is $\frac{d}{d x} [2 x^{3}] + \frac{d}{d x} [6 x] + \frac{d}{d x} [- \frac{1}{x}] + \frac{d}{d x} [3 e^{x}] + \frac{d}{d x} [- \sin (x)]$ .

$\frac{d}{d x} [2 x^{3}] + \frac{d}{d x} [6 x] + \frac{d}{d x} [- \frac{1}{x}] + \frac{d}{d x} [3 e^{x}] + \frac{d}{d x} [- \sin (x)]$

Step 2

Evaluate $\frac{d}{d x} [2 x^{3}]$ .

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Step 2.1

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

$2 \frac{d}{d x} [x^{3}] + \frac{d}{d x} [6 x] + \frac{d}{d x} [- \frac{1}{x}] + \frac{d}{d x} [3 e^{x}] + \frac{d}{d x} [- \sin (x)]$

Step 2.2

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

$2 (3 x^{2}) + \frac{d}{d x} [6 x] + \frac{d}{d x} [- \frac{1}{x}] + \frac{d}{d x} [3 e^{x}] + \frac{d}{d x} [- \sin (x)]$

Step 2.3

Multiply $3$ by $2$ .

$6 x^{2} + \frac{d}{d x} [6 x] + \frac{d}{d x} [- \frac{1}{x}] + \frac{d}{d x} [3 e^{x}] + \frac{d}{d x} [- \sin (x)]$

Step 3

Evaluate $\frac{d}{d x} [6 x]$ .

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Step 3.1

Since $6$ is constant with respect to $x$ , the derivative of $6 x$ with respect to $x$ is $6 \frac{d}{d x} [x]$ .

$6 x^{2} + 6 \frac{d}{d x} [x] + \frac{d}{d x} [- \frac{1}{x}] + \frac{d}{d x} [3 e^{x}] + \frac{d}{d x} [- \sin (x)]$

Step 3.2

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

$6 x^{2} + 6 \cdot 1 + \frac{d}{d x} [- \frac{1}{x}] + \frac{d}{d x} [3 e^{x}] + \frac{d}{d x} [- \sin (x)]$

Step 3.3

Multiply $6$ by $1$ .

$6 x^{2} + 6 + \frac{d}{d x} [- \frac{1}{x}] + \frac{d}{d x} [3 e^{x}] + \frac{d}{d x} [- \sin (x)]$

Step 4

Evaluate $\frac{d}{d x} [- \frac{1}{x}]$ .

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Step 4.1

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 $f (x) = - 1$ and $g (x) = \frac{1}{x}$ .

$6 x^{2} + 6 - \frac{d}{d x} [\frac{1}{x}] + \frac{1}{x} \frac{d}{d x} [- 1] + \frac{d}{d x} [3 e^{x}] + \frac{d}{d x} [- \sin (x)]$

Step 4.2

Rewrite $\frac{1}{x}$ as $x^{- 1}$ .

$6 x^{2} + 6 - \frac{d}{d x} [x^{- 1}] + \frac{1}{x} \frac{d}{d x} [- 1] + \frac{d}{d x} [3 e^{x}] + \frac{d}{d x} [- \sin (x)]$

Step 4.3

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

$6 x^{2} + 6 - - x^{- 2} + \frac{1}{x} \frac{d}{d x} [- 1] + \frac{d}{d x} [3 e^{x}] + \frac{d}{d x} [- \sin (x)]$

Step 4.4

Since $- 1$ is constant with respect to $x$ , the derivative of $- 1$ with respect to $x$ is $0$ .

$6 x^{2} + 6 - - x^{- 2} + \frac{1}{x} \cdot 0 + \frac{d}{d x} [3 e^{x}] + \frac{d}{d x} [- \sin (x)]$

Step 4.5

Multiply $- 1$ by $- 1$ .

$6 x^{2} + 6 + 1 x^{- 2} + \frac{1}{x} \cdot 0 + \frac{d}{d x} [3 e^{x}] + \frac{d}{d x} [- \sin (x)]$

Step 4.6

Multiply $x^{- 2}$ by $1$ .

$6 x^{2} + 6 + x^{- 2} + \frac{1}{x} \cdot 0 + \frac{d}{d x} [3 e^{x}] + \frac{d}{d x} [- \sin (x)]$

Step 4.7

Multiply $\frac{1}{x}$ by $0$ .

$6 x^{2} + 6 + x^{- 2} + 0 + \frac{d}{d x} [3 e^{x}] + \frac{d}{d x} [- \sin (x)]$

Step 4.8

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

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

Step 5

Evaluate $\frac{d}{d x} [3 e^{x}]$ .

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Step 5.1

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

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

Step 5.2

Differentiate using the Exponential Rule which states that $\frac{d}{d x} [a^{x}]$ is $a^{x} \ln (a)$ where $a$ = $e$ .

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

Step 6

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

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Step 6.1

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

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

Step 6.2

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

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

Step 7

Rewrite the expression using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

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

Step 8

Reorder terms.

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