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Homework Help: Evaluating an integral

  1. Oct 2, 2007 #1
    1. The problem statement, all variables and given/known data
    Evaluate the integral with respect to f of the following function
    http://img233.imageshack.us/img233/5303/picture1ub7.png [Broken]

    3. The attempt at a solution

    This if for one of my homeworks. I haven't taken a single math course in almost 2 years so I'm kind of rusty. I'm not sure how to evaluate this. I tried moving the 'a' outside the integral but that doesn't help. I believe there is a trig identity I'm supposed to be able to use. Any tips or hints are greatly appreciated.
    Last edited by a moderator: May 3, 2017
  2. jcsd
  3. Oct 2, 2007 #2


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    Science Advisor

    That is for the form [tex]\frac{a^2}{a^2+b^2f^2}[/tex]= [tex]\frac{1}{1+ \left(\frac{bf}{a})^2}[/tex].
    Does it help you to know that the derivative of arctan(x) is [tex]\frac{1}{x^2+ 1}[/tex]?
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