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Fourier series 3

  1. Jun 15, 2012 #1
    1. The problem statement, all variables and given/known data


    3. The attempt at a solution

    I don't see why the n is in the denominator
  2. jcsd
  3. Jun 15, 2012 #2
    reverse chain rule. What's the derivative of [itex]\frac{\sin(nx)}{n}?[/itex]

    If that doesn't make sense, then...

    you could use u-substitution to avoid going backwards.

    If you don't know u-substitution, that can be part of the problem.
  4. Jun 15, 2012 #3
    thanks, got it
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