# Math Help - Fourier Series involving modulus

1. ## Fourier Series involving modulus

Hi,

I have this question:

Calculate the fourier series for g(t) = 2 - 2|cos(t/2)|

I've sketched the graph so I know that that the function is even, meaning that bn=0, and it has period of 2*pi (from -pi to pi). However i just can't seem to work out how to deal with the modulus. I think i have to split the integrals into two parts, is this right?

Katy

2. Originally Posted by harkapobi
Hi,

I have this question:

Calculate the fourier series for g(t) = 2 - 2|cos(t/2)|

I've sketched the graph so I know that that the function is even, meaning that bn=0, and it has period of 2*pi (from -pi to pi). However i just can't seem to work out how to deal with the modulus. I think i have to split the integrals into two parts, is this right?