Calculus Examples

$\int \arctan (x) d x$

Step 1

Integrate by parts using the formula $\int u d v = u v - \int v d u$ , where $u = \arctan (x)$ and $d v = 1$ .

$\arctan (x) x - \int x \frac{1}{x^{2} + 1} d x$

Step 2

Combine $x$ and $\frac{1}{x^{2} + 1}$ .

$\arctan (x) x - \int \frac{x}{x^{2} + 1} d x$

Step 3

Let $u = x^{2} + 1$ . Then $d u = 2 x d x$ , so $\frac{1}{2} d u = x d x$ . Rewrite using $u$ and $d$ $u$ .

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Step 3.1

Let $u = x^{2} + 1$ . Find $\frac{d u}{d x}$ .

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Step 3.1.1

Differentiate $x^{2} + 1$ .

$\frac{d}{d x} [x^{2} + 1]$

Step 3.1.2

By the Sum Rule, the derivative of $x^{2} + 1$ with respect to $x$ is $\frac{d}{d x} [x^{2}] + \frac{d}{d x} [1]$ .

$\frac{d}{d x} [x^{2}] + \frac{d}{d x} [1]$

Step 3.1.3

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 2$ .

$2 x + \frac{d}{d x} [1]$

Step 3.1.4

Since $1$ is constant with respect to $x$ , the derivative of $1$ with respect to $x$ is $0$ .

$2 x + 0$

Step 3.1.5

Add $2 x$ and $0$ .

$2 x$

Step 3.2

Rewrite the problem using $u$ and $d u$ .

$\arctan (x) x - \int \frac{1}{u} \cdot \frac{1}{2} d u$

Step 4

Simplify.

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Step 4.1

Multiply $\frac{1}{u}$ by $\frac{1}{2}$ .

$\arctan (x) x - \int \frac{1}{u \cdot 2} d u$

Step 4.2

Move $2$ to the left of $u$ .

$\arctan (x) x - \int \frac{1}{2 u} d u$

Step 5

Since $\frac{1}{2}$ is constant with respect to $u$ , move $\frac{1}{2}$ out of the integral.

$\arctan (x) x - (\frac{1}{2} \int \frac{1}{u} d u)$

Step 6

The integral of $\frac{1}{u}$ with respect to $u$ is $\ln (| u |)$ .

$\arctan (x) x - \frac{1}{2} (\ln (| u |) + C)$

Step 7

Simplify.

$\arctan (x) x - \frac{1}{2} \ln (| u |) + C$

Step 8

Replace all occurrences of $u$ with $x^{2} + 1$ .

$\arctan (x) x - \frac{1}{2} \ln (| x^{2} + 1 |) + C$