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Homework Help: Another integral problem that really is a problem (for me )?

  1. Feb 20, 2015 #1
    The question is an integral that has been attached .
    Related equations :
    An attempt to the solution :

    Attached Files:

  2. jcsd
  3. Feb 20, 2015 #2
    HINT:use the formula cos(x)=cos(x/2)^2-sin(x/2)^2 in denominator.And then try again.
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