Calculus Examples

$y = \frac{5 + \tan (x)}{2 x + e^{x}}$

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 $f (x) = 5 + \tan (x)$ and $g (x) = 2 x + e^{x}$ .

$\frac{(2 x + e^{x}) \frac{d}{d x} [5 + \tan (x)] - (5 + \tan (x)) \frac{d}{d x} [2 x + e^{x}]}{{(2 x + e^{x})}^{2}}$

Step 2

Differentiate.

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Step 2.1

By the Sum Rule, the derivative of $5 + \tan (x)$ with respect to $x$ is $\frac{d}{d x} [5] + \frac{d}{d x} [\tan (x)]$ .

$\frac{(2 x + e^{x}) (\frac{d}{d x} [5] + \frac{d}{d x} [\tan (x)]) - (5 + \tan (x)) \frac{d}{d x} [2 x + e^{x}]}{{(2 x + e^{x})}^{2}}$

Step 2.2

Since $5$ is constant with respect to $x$ , the derivative of $5$ with respect to $x$ is $0$ .

$\frac{(2 x + e^{x}) (0 + \frac{d}{d x} [\tan (x)]) - (5 + \tan (x)) \frac{d}{d x} [2 x + e^{x}]}{{(2 x + e^{x})}^{2}}$

Step 2.3

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

$\frac{(2 x + e^{x}) \frac{d}{d x} [\tan (x)] - (5 + \tan (x)) \frac{d}{d x} [2 x + e^{x}]}{{(2 x + e^{x})}^{2}}$

Step 3

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

$\frac{(2 x + e^{x}) \sec^{2} (x) - (5 + \tan (x)) \frac{d}{d x} [2 x + e^{x}]}{{(2 x + e^{x})}^{2}}$

Step 4

Differentiate.

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Step 4.1

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

$\frac{(2 x + e^{x}) \sec^{2} (x) - (5 + \tan (x)) (\frac{d}{d x} [2 x] + \frac{d}{d x} [e^{x}])}{{(2 x + e^{x})}^{2}}$

Step 4.2

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

$\frac{(2 x + e^{x}) \sec^{2} (x) - (5 + \tan (x)) (2 \frac{d}{d x} [x] + \frac{d}{d x} [e^{x}])}{{(2 x + e^{x})}^{2}}$

Step 4.3

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

$\frac{(2 x + e^{x}) \sec^{2} (x) - (5 + \tan (x)) (2 \cdot 1 + \frac{d}{d x} [e^{x}])}{{(2 x + e^{x})}^{2}}$

Step 4.4

Multiply $2$ by $1$ .

$\frac{(2 x + e^{x}) \sec^{2} (x) - (5 + \tan (x)) (2 + \frac{d}{d x} [e^{x}])}{{(2 x + e^{x})}^{2}}$

Step 5

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

$\frac{(2 x + e^{x}) \sec^{2} (x) - (5 + \tan (x)) (2 + e^{x})}{{(2 x + e^{x})}^{2}}$

Step 6

Simplify.

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Step 6.1

Apply the distributive property.

$\frac{2 x \sec^{2} (x) + e^{x} \sec^{2} (x) - (5 + \tan (x)) (2 + e^{x})}{{(2 x + e^{x})}^{2}}$

Step 6.2

Apply the distributive property.

$\frac{2 x \sec^{2} (x) + e^{x} \sec^{2} (x) + (- 1 \cdot 5 - \tan (x)) (2 + e^{x})}{{(2 x + e^{x})}^{2}}$

Step 6.3

Simplify the numerator.

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Step 6.3.1

Simplify each term.

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Step 6.3.1.1

Multiply $- 1$ by $5$ .

$\frac{2 x \sec^{2} (x) + e^{x} \sec^{2} (x) + (- 5 - \tan (x)) (2 + e^{x})}{{(2 x + e^{x})}^{2}}$

Step 6.3.1.2

Expand $(- 5 - \tan (x)) (2 + e^{x})$ using the FOIL Method.

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Step 6.3.1.2.1

Apply the distributive property.

$\frac{2 x \sec^{2} (x) + e^{x} \sec^{2} (x) - 5 (2 + e^{x}) - \tan (x) (2 + e^{x})}{{(2 x + e^{x})}^{2}}$

Step 6.3.1.2.2

Apply the distributive property.

$\frac{2 x \sec^{2} (x) + e^{x} \sec^{2} (x) - 5 \cdot 2 - 5 e^{x} - \tan (x) (2 + e^{x})}{{(2 x + e^{x})}^{2}}$

Step 6.3.1.2.3

Apply the distributive property.

$\frac{2 x \sec^{2} (x) + e^{x} \sec^{2} (x) - 5 \cdot 2 - 5 e^{x} - \tan (x) \cdot 2 - \tan (x) e^{x}}{{(2 x + e^{x})}^{2}}$

Step 6.3.1.3

Simplify each term.

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Step 6.3.1.3.1

Multiply $- 5$ by $2$ .

$\frac{2 x \sec^{2} (x) + e^{x} \sec^{2} (x) - 10 - 5 e^{x} - \tan (x) \cdot 2 - \tan (x) e^{x}}{{(2 x + e^{x})}^{2}}$

Step 6.3.1.3.2

Multiply $2$ by $- 1$ .

$\frac{2 x \sec^{2} (x) + e^{x} \sec^{2} (x) - 10 - 5 e^{x} - 2 \tan (x) - \tan (x) e^{x}}{{(2 x + e^{x})}^{2}}$

Step 6.3.2

Reorder factors in $2 x \sec^{2} (x) + e^{x} \sec^{2} (x) - 10 - 5 e^{x} - 2 \tan (x) - \tan (x) e^{x}$ .

$\frac{2 x \sec^{2} (x) + e^{x} \sec^{2} (x) - 10 - 5 e^{x} - 2 \tan (x) - e^{x} \tan (x)}{{(2 x + e^{x})}^{2}}$

Step 6.4

Reorder terms.

$\frac{2 x \sec^{2} (x) + e^{x} \sec^{2} (x) - e^{x} \tan (x) - 10 - 5 e^{x} - 2 \tan (x)}{{(2 x + e^{x})}^{2}}$