Find the term a2 in the following fourier seies:
[4+5 (cos x )^2]^(1/2) dx= ao + a2 cos (2x) + a4 cos (4x)
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