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Difficult Trigo Integration, with surd.

  1. Oct 12, 2011 #1
    ∫sin x√(1+cos2x) dx

    This question have bugged me for 2 days. Need help please..
  2. jcsd
  3. Oct 12, 2011 #2
    Have you tried letting u=cosx, du=-sinxdx?
    You're then left with something that you can yet use another substitution on.
    Let's see what you can get.
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