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I have question about one integral

  1. Mar 25, 2010 #1
    3. The attempt at a solution

    Thanks in advance for your help...

    ∫[1/(1+x^2)^2] dx
  2. jcsd
  3. Mar 25, 2010 #2


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    Homework Helper

    What did you try?

    Did you try integration by parts, substitution?
  4. Mar 25, 2010 #3
    I managed to get it by using substitution and then parts. Try making u=1/(1+x^2) and then when you get du, use u=1/(1+x^2) to solve for x to replace x with u. After that, use parts. Hope that helps I can give a more detailed answer if you still are having trouble.
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