What is the integral of 1/((2x^2+1)) ?

The integral of 1/((2x^2+1)) is 1/(sqrt(2))arctan(sqrt(2)x)+C

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integral of 1/((2x^2+1))

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

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

Solution steps

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

Apply Integral Substitution

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

Take the constant out:

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

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

Use the common integral:

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

= \frac{1}{2} arctan (u)

Substitute back

u = 2 x

= \frac{1}{2} arctan (2 x)

Add a constant to the solution

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

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What is the integral of 1/((2x^2+1)) ?
The integral of 1/((2x^2+1)) is 1/(sqrt(2))arctan(sqrt(2)x)+C