Calculus Examples

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

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

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

Step 2

Differentiate.

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Step 2.1

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

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

Step 2.2

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

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

Step 2.3

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

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

Step 2.4

Multiply $2$ by $1$ .

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

Step 3

The derivative of $\cot (x)$ with respect to $x$ is $- \csc^{2} (x)$ .

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

Step 4

Differentiate.

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Step 4.1

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

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

Step 4.2

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

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

Step 4.3

Add $0$ and $\frac{d}{d x} [e^{x}]$ .

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

Step 5

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

$\frac{(5 + e^{x}) (2 - \csc^{2} (x)) - (2 x + \cot (x)) e^{x}}{{(5 + e^{x})}^{2}}$

Step 6

Simplify.

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Step 6.1

Apply the distributive property.

$\frac{(5 + e^{x}) (2 - \csc^{2} (x)) + (- (2 x) - \cot (x)) e^{x}}{{(5 + e^{x})}^{2}}$

Step 6.2

Apply the distributive property.

$\frac{(5 + e^{x}) (2 - \csc^{2} (x)) - (2 x) e^{x} - \cot (x) e^{x}}{{(5 + e^{x})}^{2}}$

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

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

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Step 6.3.1.1.1

Apply the distributive property.

$\frac{5 (2 - \csc^{2} (x)) + e^{x} (2 - \csc^{2} (x)) - (2 x) e^{x} - \cot (x) e^{x}}{{(5 + e^{x})}^{2}}$

Step 6.3.1.1.2

Apply the distributive property.

$\frac{5 \cdot 2 + 5 (- \csc^{2} (x)) + e^{x} (2 - \csc^{2} (x)) - (2 x) e^{x} - \cot (x) e^{x}}{{(5 + e^{x})}^{2}}$

Step 6.3.1.1.3

Apply the distributive property.

$\frac{5 \cdot 2 + 5 (- \csc^{2} (x)) + e^{x} \cdot 2 + e^{x} (- \csc^{2} (x)) - (2 x) e^{x} - \cot (x) e^{x}}{{(5 + e^{x})}^{2}}$

Step 6.3.1.2

Simplify each term.

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Step 6.3.1.2.1

Multiply $5$ by $2$ .

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

Step 6.3.1.2.2

Multiply $- 1$ by $5$ .

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

Step 6.3.1.2.3

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

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

Step 6.3.1.2.4

Rewrite using the commutative property of multiplication.

$\frac{10 - 5 \csc^{2} (x) + 2 e^{x} - e^{x} \csc^{2} (x) - (2 x) e^{x} - \cot (x) e^{x}}{{(5 + e^{x})}^{2}}$

Step 6.3.1.3

Multiply $2$ by $- 1$ .

$\frac{10 - 5 \csc^{2} (x) + 2 e^{x} - e^{x} \csc^{2} (x) - 2 x e^{x} - \cot (x) e^{x}}{{(5 + e^{x})}^{2}}$

Step 6.3.2

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

$\frac{10 - 5 \csc^{2} (x) + 2 e^{x} - e^{x} \csc^{2} (x) - 2 x e^{x} - e^{x} \cot (x)}{{(5 + e^{x})}^{2}}$

Step 6.4

Reorder terms.

$\frac{- e^{x} \csc^{2} (x) - 2 e^{x} x - e^{x} \cot (x) + 2 e^{x} + 10 - 5 \csc^{2} (x)}{{(5 + e^{x})}^{2}}$