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

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

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

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

- arctan (x) + x + C

Solution steps

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

\frac{x ^{2}}{x ^{2} + 1} = - \frac{1}{x ^{2} + 1} + 1

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

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 1 d x

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

\int 1 d x = x

= - arctan (x) + x

Add a constant to the solution

= - arctan (x) + x + C

7 x e^{x}

\int cos (8 x) cos (5 x) d x

\frac{d}{d x} (\frac{5 x}{3})

\frac{9 s}{9 s ^{2} + 1}

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