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Help manipulating integral to use arctan or trig-sub methods

  1. Dec 7, 2011 #1
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
    This looks like an arctan integral or a trig substitution, but in its current form neither would work without manipulation. I'm mainly looking for how to manipulate it to use one of these methods

    Last edited: Dec 7, 2011
  2. jcsd
  3. Dec 8, 2011 #2


    Staff: Mentor

    Trig substitution is the way to go here. Do you know the substitution to use?
  4. Dec 8, 2011 #3
    I'm only giving this one hint then it's up to you to complete the rest.

    square root (a^2 + u^2)

    u = a*tan(theta)
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