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Fourier series summation .help

  1. Jan 6, 2009 #1
    Fourier series summation.....help!!

    Basically, i need to show that.....

    2 + sum (m=1 to n) [4(-1)^m . cos(m.pi.x)] = 2(-1)^n.cos((n+1/2)pi.x)/cos((pi.x)/2)

    Any ideas?
  2. jcsd
  3. Jan 7, 2009 #2

    Andrew Mason

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    Re: Fourier series summation.....help!!

    Try writing the right side function as a fourier series.

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