Antiderivative of anti-trigs(arctan)

1. The problem statement, all variables and given/known data

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

2. Relevant equations

arctanx=1/1+x^2

3. 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?
 

Gib Z

Homework Helper
3,345
2
You can't just pull out the arctan! You can only pull out constants. Try making a u-substitution.
 

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