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Math Help - finding fourier series

  1. #1
    Junior Member
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    finding fourier series

    f(x) = -1 for -pi<x<o and f(x)= 1 for 0<x<pi

    i have b(n) = 4/n.pi
    but i wasnt sure how to use this to write it as fourier series.
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by panda View Post
    f(x) = -1 for -pi<x<o and f(x)= 1 for 0<x<pi

    i have b(n) = 4/n.pi
    but i wasnt sure how to use this to write it as fourier series.
    Assuming you have the b's right:

    f(x)=\sum_{n=1}^{\infty} b(n) \sin(nx) = \sum_{n=1}^{\infty} \frac{4 \pi}{n} \sin(nx)

    subject to the usual restrictions on x

    RonL
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