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Standard answer for integral of cos(2deta)cos(ndeta)

  1. Aug 21, 2005 #1
    Hi

    does anyone knows the standard answer for

    integral of cos(2deta)cos(ndeta) from 0 to 180 degress?

    for instance for integral of sin(ndeta)sin(deta) 0 to 180 degress, when n=1, it is 90 degress and when n not equals 1, it is 0...

    thanks
     
  2. jcsd
  3. Aug 21, 2005 #2

    dvs

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    Have you tried using integration by parts?
     
  4. Aug 21, 2005 #3

    Hurkyl

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    What's a "deta" or an "ndeta"? What's your variable of integration?

    You might want to review your trig identities... there's one that makes this kind of integral really easy.
     
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