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Representing cos(npi/2) in general form

  1. Feb 26, 2012 #1
    hi i am currently trying to solve a fourier series question and i realise for example cos(npi) can be represented as (-1)n.

    So i was wandering is there anyway to represent cos(npi/2) to a general form too?
  2. jcsd
  3. Feb 26, 2012 #2


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    i suppose something like
  4. Feb 26, 2012 #3
    OIC thnks.

    is there any tricks to getting the general form?
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