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How to solve this definite integral

  1. Feb 24, 2012 #1
    Hi everyone, when I was dealing with a physics problem, I find a definite integral and I cannot solve it.
    [itex]\int_{0}^{2\pi}[/itex][itex]\frac{1}{(a+cosx)^{2}}[/itex]dx
    a is constant.
    Thank you!
     
  2. jcsd
  3. Feb 24, 2012 #2
  4. Feb 24, 2012 #3
    ha ha! Weierstrass substitution is well! Thank you!
     
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