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

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

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

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

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

Solution steps

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

Expand

\frac{1 + x}{x ^{2} + 1} : \frac{1}{x ^{2} + 1} + \frac{x}{x ^{2} + 1}

Apply the Sum Rule:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

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

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

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

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

Add a constant to the solution

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

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