Calculus Examples

$\int \frac{1}{x^{2} + 16} d x$

Step 1

Simplify the expression.

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Step 1.1

Reorder $x^{2}$ and $16$ .

$\int \frac{1}{16 + x^{2}} d x$

Step 1.2

Rewrite $16$ as $4^{2}$ .

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

Step 2

The integral of $\frac{1}{4^{2} + x^{2}}$ with respect to $x$ is $\frac{1}{4} \arctan (\frac{x}{4}) + C$ .

$\frac{1}{4} \arctan (\frac{x}{4}) + C$

Step 3

Simplify the answer.

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Step 3.1

Combine $\frac{1}{4}$ and $\arctan (\frac{x}{4})$ .

$\frac{\arctan (\frac{x}{4})}{4} + C$

Step 3.2

Rewrite $\frac{\arctan (\frac{x}{4})}{4} + C$ as $\frac{1}{4} \arctan (\frac{1}{4} x) + C$ .

$\frac{1}{4} \arctan (\frac{1}{4} x) + C$