Calculus Examples

$f (x) = \frac{\sec (x)}{8 + \sec (x)}$

Step 1

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 $f (x) = \sec (x)$ and $g (x) = 8 + \sec (x)$ .

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

Step 2

The derivative of $\sec (x)$ with respect to $x$ is $\sec (x) \tan (x)$ .

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

Step 3

Differentiate.

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Step 3.1

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

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

Step 3.2

Since $8$ is constant with respect to $x$ , the derivative of $8$ with respect to $x$ is $0$ .

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

Step 3.3

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

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

Step 4

The derivative of $\sec (x)$ with respect to $x$ is $\sec (x) \tan (x)$ .

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

Step 5

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

$\frac{(8 + \sec (x)) \sec (x) \tan (x) - (\sec^{1} (x) \sec (x)) \tan (x)}{{(8 + \sec (x))}^{2}}$

Step 6

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

$\frac{(8 + \sec (x)) \sec (x) \tan (x) - (\sec^{1} (x) \sec^{1} (x)) \tan (x)}{{(8 + \sec (x))}^{2}}$

Step 7

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

$\frac{(8 + \sec (x)) \sec (x) \tan (x) - {\sec (x)}^{1 + 1} \tan (x)}{{(8 + \sec (x))}^{2}}$

Step 8

Add $1$ and $1$ .

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

Step 9

Simplify.

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Step 9.1

Apply the distributive property.

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

Step 9.2

Apply the distributive property.

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

Step 9.3

Simplify the numerator.

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Step 9.3.1

Multiply $\sec (x) \sec (x)$ .

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Step 9.3.1.1

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

$\frac{8 \sec (x) \tan (x) + \sec^{1} (x) \sec (x) \tan (x) - \sec^{2} (x) \tan (x)}{{(8 + \sec (x))}^{2}}$

Step 9.3.1.2

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

$\frac{8 \sec (x) \tan (x) + \sec^{1} (x) \sec^{1} (x) \tan (x) - \sec^{2} (x) \tan (x)}{{(8 + \sec (x))}^{2}}$

Step 9.3.1.3

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

$\frac{8 \sec (x) \tan (x) + {\sec (x)}^{1 + 1} \tan (x) - \sec^{2} (x) \tan (x)}{{(8 + \sec (x))}^{2}}$

Step 9.3.1.4

Add $1$ and $1$ .

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

Step 9.3.2

Combine the opposite terms in $8 \sec (x) \tan (x) + \sec^{2} (x) \tan (x) - \sec^{2} (x) \tan (x)$ .

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Step 9.3.2.1

Subtract $\sec^{2} (x) \tan (x)$ from $\sec^{2} (x) \tan (x)$ .

$\frac{8 \sec (x) \tan (x) + 0}{{(8 + \sec (x))}^{2}}$

Step 9.3.2.2

Add $8 \sec (x) \tan (x)$ and $0$ .

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