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Double integral and reversing order

  1. Feb 14, 2012 #1
    1. The problem statement, all variables and given/known data
    http://img10.imageshack.us/img10/3390/55486934.jpg [Broken]

    2. Relevant equations
    This is what I was thinking: tan−1(∏x)−tan−1(x)=∫[itex]^{g(x)}_{f(x)}[/itex]h(y)dy

    3. The attempt at a solution
    I don't really understand how to do this question
    Last edited by a moderator: May 5, 2017
  2. jcsd
  3. Feb 14, 2012 #2


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    Science Advisor
    Homework Helper

    Big hint. You can write the numerator as
    [tex]\int_x^{\pi x} \frac{1}{1+t^2} dt[/tex]
    Now follow the rest of the problem suggestion.
  4. Feb 14, 2012 #3
    Thanks for the hint!
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