Hello all, I just ran across this forum thanks to google and decided to register and ask for some help on my homework! I'm in 2nd year university and we have a problem set due on Friday and this is the question on it: I started to do part a) but it seems very wrong. What I did was try to normalize the function to unity so that A^2*∫(from -a to a) (a^2 - x^2)^2dx = 1 and solving for A i found A = sqrt((15*a^5)/(8*a^10 - 15*a^8 - 10*a^4 + 3)) This value seemed way too complicated but I kept going anyways hoping it would simplify, what I did next was try to calculate A_n such that A_n = ∫(from 0 to a) dx*Ψ(x,0)*Ψ_n(star)(x,0) = ∫(from 0 to a) dx*Ψ*sin((n*pi*x)/a) but then once again I got some fairly complicated function so I stopped. Can anyone help me out here? I am very lost! Thanks!