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Math Help - basic fourier series query

  1. #1
    Junior Member
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    basic fourier series query

    is the fourier coefficient an for f(x)=x^2 , -pi<x<pi

    (4/n^2)(-1)^n

    because text book says

    (4/n^2)(-1)^(n+1)
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  2. #2
    MHF Contributor
    Opalg's Avatar
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    I agree with you. It should be n, not n+1.
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