1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 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
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook