What is the integral of 3/(16+x^2) ?

The integral of 3/(16+x^2) is 3/4 arctan(x/4)+C

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integral of 3/(16+x^2)

\int \frac{3}{16 + x ^{2}} d x

\frac{3}{4} arctan (\frac{x}{4}) + C

Solution steps

\int \frac{3}{16 + x ^{2}} d x

Take the constant out:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= 3 \cdot \int \frac{1}{16 + x ^{2}} d x

Apply Integral Substitution

= 3 \cdot \int \frac{1}{4 ( u ^{2} + 1 )} d u

Take the constant out:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= 3 \cdot \frac{1}{4} \cdot \int \frac{1}{u ^{2} + 1} d u

Use the common integral:

\int \frac{1}{u ^{2} + 1} d u = arctan (u)

= 3 \cdot \frac{1}{4} arctan (u)

Substitute back

u = \frac{x}{4}

= 3 \cdot \frac{1}{4} arctan (\frac{x}{4})

Simplify

3 \cdot \frac{1}{4} arctan (\frac{x}{4}) : \frac{3}{4} arctan (\frac{x}{4})

= \frac{3}{4} arctan (\frac{x}{4})

Add a constant to the solution

= \frac{3}{4} arctan (\frac{x}{4}) + C

What is the integral of 3/(16+x^2) ?
The integral of 3/(16+x^2) is 3/4 arctan(x/4)+C