Calculus Examples

$y = \frac{8 x}{3 - \tan (x)}$

Step 1

Differentiate both sides of the equation.

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

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

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

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

Step 3.2

Differentiate using the Quotient Rule which states that $\frac{d}{d x} [\frac{f (x)}{g (x)}]$ is $\frac{g (x) \frac{d}{d x} [f (x)] - f (x) \frac{d}{d x} [g (x)]}{{g (x)}^{2}}$ where $f (x) = x$ and $g (x) = 3 - \tan (x)$ .

$8 \frac{(3 - \tan (x)) \frac{d}{d x} [x] - x \frac{d}{d x} [3 - \tan (x)]}{{(3 - \tan (x))}^{2}}$

Step 3.3

Differentiate.

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Step 3.3.1

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

$8 \frac{(3 - \tan (x)) \cdot 1 - x \frac{d}{d x} [3 - \tan (x)]}{{(3 - \tan (x))}^{2}}$

Step 3.3.2

Multiply $3 - \tan (x)$ by $1$ .

$8 \frac{3 - \tan (x) - x \frac{d}{d x} [3 - \tan (x)]}{{(3 - \tan (x))}^{2}}$

Step 3.3.3

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

$8 \frac{3 - \tan (x) - x (\frac{d}{d x} [3] + \frac{d}{d x} [- \tan (x)])}{{(3 - \tan (x))}^{2}}$

Step 3.3.4

Since $3$ is constant with respect to $x$ , the derivative of $3$ with respect to $x$ is $0$ .

$8 \frac{3 - \tan (x) - x (0 + \frac{d}{d x} [- \tan (x)])}{{(3 - \tan (x))}^{2}}$

Step 3.3.5

Add $0$ and $\frac{d}{d x} [- \tan (x)]$ .

$8 \frac{3 - \tan (x) - x \frac{d}{d x} [- \tan (x)]}{{(3 - \tan (x))}^{2}}$

Step 3.3.6

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

$8 \frac{3 - \tan (x) - x (- \frac{d}{d x} [\tan (x)])}{{(3 - \tan (x))}^{2}}$

Step 3.3.7

Multiply.

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Step 3.3.7.1

Multiply $- 1$ by $- 1$ .

$8 \frac{3 - \tan (x) + 1 x \frac{d}{d x} [\tan (x)]}{{(3 - \tan (x))}^{2}}$

Step 3.3.7.2

Multiply $x$ by $1$ .

$8 \frac{3 - \tan (x) + x \frac{d}{d x} [\tan (x)]}{{(3 - \tan (x))}^{2}}$

Step 3.4

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

$8 \frac{3 - \tan (x) + x \sec^{2} (x)}{{(3 - \tan (x))}^{2}}$

Step 3.5

Combine $8$ and $\frac{3 - \tan (x) + x \sec^{2} (x)}{{(3 - \tan (x))}^{2}}$ .

$\frac{8 (3 - \tan (x) + x \sec^{2} (x))}{{(3 - \tan (x))}^{2}}$

Step 3.6

Simplify.

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Step 3.6.1

Apply the distributive property.

$\frac{8 \cdot 3 + 8 (- \tan (x)) + 8 (x \sec^{2} (x))}{{(3 - \tan (x))}^{2}}$

Step 3.6.2

Simplify each term.

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Step 3.6.2.1

Multiply $8$ by $3$ .

$\frac{24 + 8 (- \tan (x)) + 8 (x \sec^{2} (x))}{{(3 - \tan (x))}^{2}}$

Step 3.6.2.2

Multiply $- 1$ by $8$ .

$\frac{24 - 8 \tan (x) + 8 x \sec^{2} (x)}{{(3 - \tan (x))}^{2}}$

Step 3.6.3

Reorder terms.

$\frac{8 x \sec^{2} (x) + 24 - 8 \tan (x)}{{(3 - \tan (x))}^{2}}$

Step 3.6.4

Factor $8$ out of $8 x \sec^{2} (x) + 24 - 8 \tan (x)$ .

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Step 3.6.4.1

Factor $8$ out of $8 x \sec^{2} (x)$ .

$\frac{8 (x \sec^{2} (x)) + 24 - 8 \tan (x)}{{(3 - \tan (x))}^{2}}$

Step 3.6.4.2

Factor $8$ out of $24$ .

$\frac{8 (x \sec^{2} (x)) + 8 (3) - 8 \tan (x)}{{(3 - \tan (x))}^{2}}$

Step 3.6.4.3

Factor $8$ out of $- 8 \tan (x)$ .

$\frac{8 (x \sec^{2} (x)) + 8 (3) + 8 (- \tan (x))}{{(3 - \tan (x))}^{2}}$

Step 3.6.4.4

Factor $8$ out of $8 (x \sec^{2} (x)) + 8 (3)$ .

$\frac{8 (x \sec^{2} (x) + 3) + 8 (- \tan (x))}{{(3 - \tan (x))}^{2}}$

Step 3.6.4.5

Factor $8$ out of $8 (x \sec^{2} (x) + 3) + 8 (- \tan (x))$ .

$\frac{8 (x \sec^{2} (x) + 3 - \tan (x))}{{(3 - \tan (x))}^{2}}$

Step 4

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

$y' = \frac{8 (x \sec^{2} (x) + 3 - \tan (x))}{{(3 - \tan (x))}^{2}}$

Step 5

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

$\frac{d y}{d x} = \frac{8 (x \sec^{2} (x) + 3 - \tan (x))}{{(3 - \tan (x))}^{2}}$