How do work out the Fourier series of f(x) = |x| - [tex]\pi[/tex] on ([tex]\pi[/tex],[tex]\pi[/tex]].
Yes. And for the an you have even times even and you can use symmetry, which will help you with the absolute values. Again, look at "half range" expansions.I see. Since f(x) is an even function, when it goes to finding bn you multiply an even function with sin which an odd function to get an odd function and the integral of an odd function is always zero