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Homework Help: Simple question about fourier series

  1. Oct 31, 2013 #1
    Find the Fourier serie of f(x)=|sin(x)| on the interval (-1,1)

    I'm just a little confused, does that mean that I have to integrate from -1 to 1 to find the coefficients ? Because the formula of the coefficients is in terms of the period T, for this function the period is pi. Or do I have to consider it only in -1,1 and take the period T=2 ?

    Last edited: Oct 31, 2013
  2. jcsd
  3. Oct 31, 2013 #2


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    For a homework problem, it seems like the given interval might be a typo or the function was supposed to be ##\lvert \sin \pi x \rvert##; however, there's no real reason the interval couldn't be (-1, 1) for the given function. I'd check with your instructor if I were you.
  4. Oct 31, 2013 #3
    It's not a homework, it's an exercise in a previous exam..
    the exam is tomorrow and I just saw this exercise.. :frown:

    EDIT: I sent an email to an instructor, and I had my answer !
    Last edited: Oct 31, 2013
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