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Math Help - Finding Fourier Sine Series Problem

  1. #1
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    Finding Fourier Sine Series Problem

     f(x)=\sum_{n=1}^{\infty}b_n\sin\frac{\pi nx}{L}

    f(x) = { 200 for 0<x<pi/2
    0 for pi/2<x<pi

    Sorry I am not familiar with LaTeX. But I am having trouble with this question. I am also confused about whether the L=pi or L=pi/2?
    The answer I get does not seem to agree when I plug in a value for x. So I am at a loss here. Been trying to figure out for hours.
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  2. #2
    MHF Contributor
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    Re: Finding Fourier Sine Series Problem

    Hey mneox.

    Hint: Look at the length of the interval over which the function is defined where f(x+L) = f(x).
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