Calculus Examples

$\int \frac{1}{4 + x^{2}} d x$

Step 1

Rewrite $4$ as $2^{2}$ .

$\int \frac{1}{2^{2} + x^{2}} d x$

Step 2

The integral of $\frac{1}{2^{2} + x^{2}}$ with respect to $x$ is $\frac{1}{2} \arctan (\frac{x}{2}) + C$ .

$\frac{1}{2} \arctan (\frac{x}{2}) + C$

Step 3

Simplify the answer.

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Step 3.1

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

$\frac{\arctan (\frac{x}{2})}{2} + C$

Step 3.2

Rewrite $\frac{\arctan (\frac{x}{2})}{2} + C$ as $\frac{1}{2} \arctan (\frac{1}{2} x) + C$ .

$\frac{1}{2} \arctan (\frac{1}{2} x) + C$