Calculus Examples

$x^{\cos (2 x)}$

Step 1

Use the properties of logarithms to simplify the differentiation.

Tap for more steps...

Rewrite $x^{\cos (2 x)}$ as $e^{\ln (x^{\cos (2 x)})}$ .

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

Expand $\ln (x^{\cos (2 x)})$ by moving $\cos (2 x)$ outside the logarithm.

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

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 $g (x) = \cos (2 x) \ln (x)$ .

Tap for more steps...

To apply the Chain Rule, set $u_{1}$ as $\cos (2 x) \ln (x)$ .

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

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

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

Replace all occurrences of $u_{1}$ with $\cos (2 x) \ln (x)$ .

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

Step 3

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 $f (x) = \cos (2 x)$ and $g (x) = \ln (x)$ .

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

Step 4

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

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

Step 5

Combine $\cos (2 x)$ and $\frac{1}{x}$ .

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

Step 6

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = \cos (x)$ and $g (x) = 2 x$ .

Tap for more steps...

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

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

The derivative of $\cos (u_{2})$ with respect to $u_{2}$ is $- \sin (u_{2})$ .

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

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

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

Step 7

Differentiate.

Tap for more steps...

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

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

Multiply $2$ by $- 1$ .

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

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

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

Multiply $- 2$ by $1$ .

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

Step 8

Simplify.

Tap for more steps...

Apply the distributive property.

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

Combine $e^{\cos (2 x) \ln (x)}$ and $\frac{\cos (2 x)}{x}$ .

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

Reorder terms.

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