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Antiderivative of anti-trigs(arctan)

  1. Feb 23, 2009 #1
    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?
     
  2. jcsd
  3. Feb 23, 2009 #2

    Gib Z

    User Avatar
    Homework Helper

    You can't just pull out the arctan! You can only pull out constants. Try making a u-substitution.
     
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