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Math Help - fourier series

  1. #1
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    fourier series

    hello.
    could you help me with this question?
    i dont know how to begin..
    thank you.
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by garden cat View Post
    hello.
    could you help me with this question?
    i dont know how to begin..
    thank you.
    1. What is the Fourier series of f'?

    2. If \int_{-\pi}^{\pi} |f'(x)|^2 dx = \int_{-\pi}^{\pi} |f(x)|^2 dx what does that tell you about the coeficients of the Fourier series of  f' and f?

    3. What does f \in E(-\pi, \pi) tell you about the Fourier series of f?

    RonL
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