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## Homework Statement

arctan(x)/(1+x2). finding the antiderivative

## Homework Equations

arctanx=1/1+x^2

## The Attempt at a Solution

I tried pulling out arctan(x) S 1/(1+x^2) dx --> arctan^2(x)+c but the answer also has a 1/2 in front of the arctan...where'd that come from?