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

  1. Nov 13, 2007 #1
    1. The problem statement, all variables and given/known data

    Find the term a2 in the following fourier seies:

    [4+5 (cos x )^2]^(1/2) dx= ao + a2 cos (2x) + a4 cos (4x)

    3. The attempt at a solution
    The only thing I can think about is transforming that to complex numbers but I am not completely sure...

    I know that a0 is supposed to be 3.966360

  2. jcsd
  3. Nov 14, 2007 #2


    User Avatar
    Science Advisor

    Is that an integral on the left side? Are you asked to write
    [tex]\int\sqrt{4+ 5 cos^2(x)} dx[/tex]
    as a Fourier series?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook