Calculus Examples

$y = x^{9 x}$

Step 1

Use the properties of logarithms to simplify the differentiation.

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Step 1.1

Rewrite $x^{9 x}$ as $e^{\ln (x^{9 x})}$ .

$\frac{d}{d x} [e^{\ln (x^{9 x})}]$

Step 1.2

Expand $\ln (x^{9 x})$ by moving $9 x$ outside the logarithm.

$\frac{d}{d x} [e^{9 x \ln (x)}]$

Step 2

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 $g (x) = 9 x \ln (x)$ .

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Step 2.1

To apply the Chain Rule, set $u$ as $9 x \ln (x)$ .

$\frac{d}{d u} [e^{u}] \frac{d}{d x} [9 x \ln (x)]$

Step 2.2

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

$e^{u} \frac{d}{d x} [9 x \ln (x)]$

Step 2.3

Replace all occurrences of $u$ with $9 x \ln (x)$ .

$e^{9 x \ln (x)} \frac{d}{d x} [9 x \ln (x)]$

Step 3

Since $9$ is constant with respect to $x$ , the derivative of $9 x \ln (x)$ with respect to $x$ is $9 \frac{d}{d x} [x \ln (x)]$ .

$e^{9 x \ln (x)} (9 \frac{d}{d x} [x \ln (x)])$

Step 4

Differentiate using the Product Rule which states that $\frac{d}{d x} [f (x) g (x)]$ is $f (x) \frac{d}{d x} [g (x)] + g (x) \frac{d}{d x} [f (x)]$ where $f (x) = x$ and $g (x) = \ln (x)$ .

$e^{9 x \ln (x)} (9 (x \frac{d}{d x} [\ln (x)] + \ln (x) \frac{d}{d x} [x]))$

Step 5

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

$e^{9 x \ln (x)} (9 (x \frac{1}{x} + \ln (x) \frac{d}{d x} [x]))$

Step 6

Differentiate using the Power Rule.

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Step 6.1

Combine $x$ and $\frac{1}{x}$ .

$e^{9 x \ln (x)} (9 (\frac{x}{x} + \ln (x) \frac{d}{d x} [x]))$

Step 6.2

Cancel the common factor of $x$ .

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Step 6.2.1

Cancel the common factor.

$e^{9 x \ln (x)} (9 (\frac{x}{x} + \ln (x) \frac{d}{d x} [x]))$

Step 6.2.2

Rewrite the expression.

$e^{9 x \ln (x)} (9 (1 + \ln (x) \frac{d}{d x} [x]))$

Step 6.3

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

$e^{9 x \ln (x)} (9 (1 + \ln (x) \cdot 1))$

Step 6.4

Multiply $\ln (x)$ by $1$ .

$e^{9 x \ln (x)} (9 (1 + \ln (x)))$

Step 7

Simplify.

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Step 7.1

Apply the distributive property.

$e^{9 x \ln (x)} (9 \cdot 1 + 9 \ln (x))$

Step 7.2

Apply the distributive property.

$e^{9 x \ln (x)} (9 \cdot 1) + e^{9 x \ln (x)} (9 \ln (x))$

Step 7.3

Combine terms.

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Step 7.3.1

Multiply $9$ by $1$ .

$e^{9 x \ln (x)} \cdot 9 + e^{9 x \ln (x)} (9 \ln (x))$

Step 7.3.2

Move $9$ to the left of $e^{9 x \ln (x)}$ .

$9 e^{9 x \ln (x)} + e^{9 x \ln (x)} (9 \ln (x))$

Step 7.4

Reorder terms.

$9 e^{9 x \ln (x)} \ln (x) + 9 e^{9 x \ln (x)}$