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Proof of Fourier Series Coeffecients

  1. Oct 22, 2013 #1
    1. The problem statement, all variables and given/known data

    #35 on this page


    2. Relevant equations

    Integral of a series can be assumed to be the sum of integrals

    3. The attempt at a solution

    Picture of Work

    I am not sure where to proceed from here, advice?
     
  2. jcsd
  3. Oct 22, 2013 #2
    Try to explicitely calculate

    [tex]\int_0^\lambda A_n \cos(\frac{2\pi n}{\lambda}x)dx[/tex]
     
  4. Oct 22, 2013 #3
    This is good advice.
     
  5. Oct 24, 2013 #4
    Ahh, that whole scary monster is zero! Thanks for the advice. :)
     
  6. Oct 25, 2013 #5
    Keep an eye on periodicity. It can save you a lot of work.
     
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