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Math Help - Derivative of a fourier series

  1. #1
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    Derivative of a fourier series

    hello all...
    I have this two 2_pi periodic function ..
    Which of the following functions has a fourier series for iis derivative ??

    (i) f(x) = x^3 [-pi<=x<pi]
    (ii) f(x) = 0 ; -pi<=x<0
    = 1-x ; 0<=x<pi

    It will be helpful if you explain every step :-)

    Thanks in advance
    Last edited by maruf10; April 11th 2011 at 08:37 PM. Reason: wrong title
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  2. #2
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    What's Fourier's theorem?
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