Calculus Examples

$y = 3 x^{8} - \sin (x) + x^{3} \tan (x)$

Step 1

Differentiate both sides of the equation.

$\frac{d}{d x} (y) = \frac{d}{d x} (3 x^{8} - \sin (x) + x^{3} \tan (x))$

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

By the Sum Rule, the derivative of $3 x^{8} - \sin (x) + x^{3} \tan (x)$ with respect to $x$ is $\frac{d}{d x} [3 x^{8}] + \frac{d}{d x} [- \sin (x)] + \frac{d}{d x} [x^{3} \tan (x)]$ .

$\frac{d}{d x} [3 x^{8}] + \frac{d}{d x} [- \sin (x)] + \frac{d}{d x} [x^{3} \tan (x)]$

Step 3.2

Evaluate $\frac{d}{d x} [3 x^{8}]$ .

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Step 3.2.1

Since $3$ is constant with respect to $x$ , the derivative of $3 x^{8}$ with respect to $x$ is $3 \frac{d}{d x} [x^{8}]$ .

$3 \frac{d}{d x} [x^{8}] + \frac{d}{d x} [- \sin (x)] + \frac{d}{d x} [x^{3} \tan (x)]$

Step 3.2.2

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 8$ .

$3 (8 x^{7}) + \frac{d}{d x} [- \sin (x)] + \frac{d}{d x} [x^{3} \tan (x)]$

Step 3.2.3

Multiply $8$ by $3$ .

$24 x^{7} + \frac{d}{d x} [- \sin (x)] + \frac{d}{d x} [x^{3} \tan (x)]$

Step 3.3

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

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Step 3.3.1

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

$24 x^{7} - \frac{d}{d x} [\sin (x)] + \frac{d}{d x} [x^{3} \tan (x)]$

Step 3.3.2

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

$24 x^{7} - \cos (x) + \frac{d}{d x} [x^{3} \tan (x)]$

Step 3.4

Evaluate $\frac{d}{d x} [x^{3} \tan (x)]$ .

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Step 3.4.1

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 $f (x) = x^{3}$ and $g (x) = \tan (x)$ .

$24 x^{7} - \cos (x) + x^{3} \frac{d}{d x} [\tan (x)] + \tan (x) \frac{d}{d x} [x^{3}]$

Step 3.4.2

The derivative of $\tan (x)$ with respect to $x$ is $\sec^{2} (x)$ .

$24 x^{7} - \cos (x) + x^{3} \sec^{2} (x) + \tan (x) \frac{d}{d x} [x^{3}]$

Step 3.4.3

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

$24 x^{7} - \cos (x) + x^{3} \sec^{2} (x) + \tan (x) (3 x^{2})$

Step 3.5

Simplify.

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Step 3.5.1

Reorder terms.

$24 x^{7} + x^{3} \sec^{2} (x) + 3 x^{2} \tan (x) - \cos (x)$

Step 3.5.2

Simplify each term.

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Step 3.5.2.1

Rewrite $\sec (x)$ in terms of sines and cosines.

$24 x^{7} + x^{3} {(\frac{1}{\cos (x)})}^{2} + 3 x^{2} \tan (x) - \cos (x)$

Step 3.5.2.2

Apply the product rule to $\frac{1}{\cos (x)}$ .

$24 x^{7} + x^{3} \frac{1^{2}}{\cos^{2} (x)} + 3 x^{2} \tan (x) - \cos (x)$

Step 3.5.2.3

One to any power is one.

$24 x^{7} + x^{3} \frac{1}{\cos^{2} (x)} + 3 x^{2} \tan (x) - \cos (x)$

Step 3.5.2.4

Combine $x^{3}$ and $\frac{1}{\cos^{2} (x)}$ .

$24 x^{7} + \frac{x^{3}}{\cos^{2} (x)} + 3 x^{2} \tan (x) - \cos (x)$

Step 3.5.2.5

Rewrite $\tan (x)$ in terms of sines and cosines.

$24 x^{7} + \frac{x^{3}}{\cos^{2} (x)} + 3 x^{2} \frac{\sin (x)}{\cos (x)} - \cos (x)$

Step 3.5.2.6

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

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Step 3.5.2.6.1

Combine $3$ and $\frac{\sin (x)}{\cos (x)}$ .

$24 x^{7} + \frac{x^{3}}{\cos^{2} (x)} + x^{2} \frac{3 \sin (x)}{\cos (x)} - \cos (x)$

Step 3.5.2.6.2

Combine $x^{2}$ and $\frac{3 \sin (x)}{\cos (x)}$ .

$24 x^{7} + \frac{x^{3}}{\cos^{2} (x)} + \frac{x^{2} (3 \sin (x))}{\cos (x)} - \cos (x)$

Step 3.5.2.7

Move $3$ to the left of $x^{2}$ .

$24 x^{7} + \frac{x^{3}}{\cos^{2} (x)} + \frac{3 x^{2} \sin (x)}{\cos (x)} - \cos (x)$

Step 3.5.3

Simplify each term.

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Step 3.5.3.1

Multiply by $1$ .

$24 x^{7} + \frac{x^{3}}{\cos^{2} (x) \cdot 1} + \frac{3 x^{2} \sin (x)}{\cos (x)} - \cos (x)$

Step 3.5.3.2

Separate fractions.

$24 x^{7} + \frac{x^{3}}{1} \cdot \frac{1}{\cos^{2} (x)} + \frac{3 x^{2} \sin (x)}{\cos (x)} - \cos (x)$

Step 3.5.3.3

Convert from $\frac{1}{\cos^{2} (x)}$ to $\sec^{2} (x)$ .

$24 x^{7} + \frac{x^{3}}{1} \sec^{2} (x) + \frac{3 x^{2} \sin (x)}{\cos (x)} - \cos (x)$

Step 3.5.3.4

Divide $x^{3}$ by $1$ .

$24 x^{7} + x^{3} \sec^{2} (x) + \frac{3 x^{2} \sin (x)}{\cos (x)} - \cos (x)$

Step 3.5.3.5

Separate fractions.

$24 x^{7} + x^{3} \sec^{2} (x) + \frac{3 x^{2}}{1} \cdot \frac{\sin (x)}{\cos (x)} - \cos (x)$

Step 3.5.3.6

Convert from $\frac{\sin (x)}{\cos (x)}$ to $\tan (x)$ .

$24 x^{7} + x^{3} \sec^{2} (x) + \frac{3 x^{2}}{1} \tan (x) - \cos (x)$

Step 3.5.3.7

Divide $3 x^{2}$ by $1$ .

$24 x^{7} + x^{3} \sec^{2} (x) + 3 x^{2} \tan (x) - \cos (x)$

Step 4

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

$y' = 24 x^{7} + x^{3} \sec^{2} (x) + 3 x^{2} \tan (x) - \cos (x)$

Step 5

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

$\frac{d y}{d x} = 24 x^{7} + x^{3} \sec^{2} (x) + 3 x^{2} \tan (x) - \cos (x)$