1. The problem statement, all variables and given/known data Find the Fourier series for the following function (0 ≤ x ≤ L): y(x) = Ax(L-x) 2. Relevant equations 3. The attempt at a solution 1. We start with the sum from n to infinity of A_n*sin(n*pi*x/L) where An = B_n*Ax(l-x) 2. We have the integral from 0 to L of f(x)*sin(m*pi*x/L) dx I really have no idea what to do, I am francticlly looking through notes and websites. I understand the Fourier sine series should be pretty easy to find, it's just plugging in values, but there are so many different equations/elements. Let me try this solution: f(x) = L/pi(sum from n = 1 to infinity of sin(n*pi*x/L) Ah?