Homework Statement
I am only interested in 9 (a)
Determine the Fourier Cosine series of the function g(x) = x(L-x) for 0 < x < L
Homework Equations
The Answer for 9 a.
g(x) = (L^2)/6 - ∑(L^2/(nπ)^2)cos(2nπx/L)
This is the relevant equation given where ω=π/L
f(t) = a0+∑ancos(nωt)
a0=1/L...