Calculus Examples

${(e^{x} + x)}^{\frac{1}{x}}$

Step 1

Use the properties of logarithms to simplify the differentiation.

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Step 1.1

Rewrite ${(e^{x} + x)}^{\frac{1}{x}}$ as $e^{\ln ({(e^{x} + x)}^{\frac{1}{x}})}$ .

$\frac{d}{d x} [e^{\ln ({(e^{x} + x)}^{\frac{1}{x}})}]$

Step 1.2

Expand $\ln ({(e^{x} + x)}^{\frac{1}{x}})$ by moving $\frac{1}{x}$ outside the logarithm.

$\frac{d}{d x} [e^{\frac{1}{x} \ln (e^{x} + x)}]$

Step 2

Combine $\frac{1}{x}$ and $\ln (e^{x} + x)$ .

$\frac{d}{d x} [e^{\frac{\ln (e^{x} + x)}{x}}]$

Step 3

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = e^{x}$ and $g (x) = \frac{\ln (e^{x} + x)}{x}$ .

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Step 3.1

To apply the Chain Rule, set $u_{1}$ as $\frac{\ln (e^{x} + x)}{x}$ .

$\frac{d}{d u_{1}} [e^{u_{1}}] \frac{d}{d x} [\frac{\ln (e^{x} + x)}{x}]$

Step 3.2

Differentiate using the Exponential Rule which states that $\frac{d}{d u_{1}} [a^{u_{1}}]$ is $a^{u_{1}} \ln (a)$ where $a$ = $e$ .

$e^{u_{1}} \frac{d}{d x} [\frac{\ln (e^{x} + x)}{x}]$

Step 3.3

Replace all occurrences of $u_{1}$ with $\frac{\ln (e^{x} + x)}{x}$ .

$e^{\frac{\ln (e^{x} + x)}{x}} \frac{d}{d x} [\frac{\ln (e^{x} + x)}{x}]$

Step 4

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 $f (x) = \ln (e^{x} + x)$ and $g (x) = x$ .

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

Step 5

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = \ln (x)$ and $g (x) = e^{x} + x$ .

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Step 5.1

To apply the Chain Rule, set $u_{2}$ as $e^{x} + x$ .

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

Step 5.2

The derivative of $\ln (u_{2})$ with respect to $u_{2}$ is $\frac{1}{u_{2}}$ .

$e^{\frac{\ln (e^{x} + x)}{x}} \frac{x (\frac{1}{u_{2}} \frac{d}{d x} [e^{x} + x]) - \ln (e^{x} + x) \frac{d}{d x} [x]}{x^{2}}$

Step 5.3

Replace all occurrences of $u_{2}$ with $e^{x} + x$ .

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

Step 6

Differentiate using the Sum Rule.

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Step 6.1

Combine $\frac{1}{e^{x} + x}$ and $x$ .

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

Step 6.2

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

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

Step 7

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

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

Step 8

Differentiate using the Power Rule.

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Step 8.1

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

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

Step 8.2

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

$e^{\frac{\ln (e^{x} + x)}{x}} \frac{\frac{x}{e^{x} + x} (e^{x} + 1) - \ln (e^{x} + x) \cdot 1}{x^{2}}$

Step 8.3

Combine fractions.

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Step 8.3.1

Multiply $- 1$ by $1$ .

$e^{\frac{\ln (e^{x} + x)}{x}} \frac{\frac{x}{e^{x} + x} (e^{x} + 1) - \ln (e^{x} + x)}{x^{2}}$

Step 8.3.2

Combine $e^{\frac{\ln (e^{x} + x)}{x}}$ and $\frac{\frac{x}{e^{x} + x} (e^{x} + 1) - \ln (e^{x} + x)}{x^{2}}$ .

$\frac{e^{\frac{\ln (e^{x} + x)}{x}} (\frac{x}{e^{x} + x} (e^{x} + 1) - \ln (e^{x} + x))}{x^{2}}$

Step 9

Simplify.

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Step 9.1

Simplify the numerator.

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Step 9.1.1

Multiply $\frac{x}{e^{x} + x}$ by $e^{x} + 1$ .

$\frac{e^{\frac{\ln (e^{x} + x)}{x}} (\frac{x (e^{x} + 1)}{e^{x} + x} - \ln (e^{x} + x))}{x^{2}}$

Step 9.1.2

To write $- \ln (e^{x} + x)$ as a fraction with a common denominator, multiply by $\frac{e^{x} + x}{e^{x} + x}$ .

$\frac{e^{\frac{\ln (e^{x} + x)}{x}} (\frac{x (e^{x} + 1)}{e^{x} + x} - \ln (e^{x} + x) \cdot \frac{e^{x} + x}{e^{x} + x})}{x^{2}}$

Step 9.1.3

Combine $- \ln (e^{x} + x)$ and $\frac{e^{x} + x}{e^{x} + x}$ .

$\frac{e^{\frac{\ln (e^{x} + x)}{x}} (\frac{x (e^{x} + 1)}{e^{x} + x} + \frac{- \ln (e^{x} + x) (e^{x} + x)}{e^{x} + x})}{x^{2}}$

Step 9.1.4

Combine the numerators over the common denominator.

$\frac{e^{\frac{\ln (e^{x} + x)}{x}} \frac{x (e^{x} + 1) - \ln (e^{x} + x) (e^{x} + x)}{e^{x} + x}}{x^{2}}$

Step 9.1.5

Simplify the numerator.

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Step 9.1.5.1

Apply the distributive property.

$\frac{e^{\frac{\ln (e^{x} + x)}{x}} \frac{x e^{x} + x \cdot 1 - \ln (e^{x} + x) (e^{x} + x)}{e^{x} + x}}{x^{2}}$

Step 9.1.5.2

Multiply $x$ by $1$ .

$\frac{e^{\frac{\ln (e^{x} + x)}{x}} \frac{x e^{x} + x - \ln (e^{x} + x) (e^{x} + x)}{e^{x} + x}}{x^{2}}$

Step 9.1.5.3

Apply the distributive property.

$\frac{e^{\frac{\ln (e^{x} + x)}{x}} \frac{x e^{x} + x - \ln (e^{x} + x) e^{x} - \ln (e^{x} + x) x}{e^{x} + x}}{x^{2}}$

Step 9.1.6

Combine $e^{\frac{\ln (e^{x} + x)}{x}}$ and $\frac{x e^{x} + x - \ln (e^{x} + x) e^{x} - \ln (e^{x} + x) x}{e^{x} + x}$ .

$\frac{\frac{e^{\frac{\ln (e^{x} + x)}{x}} (x e^{x} + x - \ln (e^{x} + x) e^{x} - \ln (e^{x} + x) x)}{e^{x} + x}}{x^{2}}$

Step 9.1.7

Reorder factors in $\frac{e^{\frac{\ln (e^{x} + x)}{x}} (x e^{x} + x - \ln (e^{x} + x) e^{x} - \ln (e^{x} + x) x)}{e^{x} + x}$ .

$\frac{\frac{e^{\frac{\ln (e^{x} + x)}{x}} (x e^{x} + x - e^{x} \ln (e^{x} + x) - x \ln (e^{x} + x))}{e^{x} + x}}{x^{2}}$

Step 9.2

Combine terms.

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Step 9.2.1

Rewrite $\frac{\frac{e^{\frac{\ln (e^{x} + x)}{x}} (x e^{x} + x - e^{x} \ln (e^{x} + x) - x \ln (e^{x} + x))}{e^{x} + x}}{x^{2}}$ as a product.

$\frac{e^{\frac{\ln (e^{x} + x)}{x}} (x e^{x} + x - e^{x} \ln (e^{x} + x) - x \ln (e^{x} + x))}{e^{x} + x} \cdot \frac{1}{x^{2}}$

Step 9.2.2

Multiply $\frac{e^{\frac{\ln (e^{x} + x)}{x}} (x e^{x} + x - e^{x} \ln (e^{x} + x) - x \ln (e^{x} + x))}{e^{x} + x}$ by $\frac{1}{x^{2}}$ .

$\frac{e^{\frac{\ln (e^{x} + x)}{x}} (x e^{x} + x - e^{x} \ln (e^{x} + x) - x \ln (e^{x} + x))}{(e^{x} + x) x^{2}}$

Step 9.3

Reorder terms.

$\frac{e^{\frac{\ln (e^{x} + x)}{x}} (x e^{x} + x - e^{x} \ln (e^{x} + x) - x \ln (e^{x} + x))}{x^{2} (e^{x} + x)}$