1. ## Fourier series-02

Please help me to find the answer for "How to obtain the Fourier series for the function f(x) = |cos x| where -pi < x < pi"

2. Just calculate the fourier coefficients of the fourier series, and put them into the fourier series fomullar .

3. you are asking me for:

$f(x)=\mbox{-Cos x if} -\pi

$f(x)=\mbox{Cos x if }0

and then find the $a_n, a_0, b_n$

isn't it...