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"
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Just calculate the fourier coefficients of the fourier series, and put them into the fourier series fomullar .
you are asking me for: $\displaystyle f(x)=\mbox{-Cos x if} -\pi<x<0$ $\displaystyle f(x)=\mbox{Cos x if }0<x<\pi$ and then find the $\displaystyle a_n, a_0, b_n$ isn't it...
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