Quantum -- Find the formal expression of the coefficient cn(t=o) Hello everyone, I'm really stuck on the first question of an exercise, so I can't start!! 1. The problem statement, all variables and given/known data ψ(x,t) a wave function normalized and solution of Shrodinger equation for a given potential. I the eigenfunctions are given by the ∅n(x) (supposed to be a phi) with eigen values En so we can write ψ(x,t) as: ψ(x,t)=Ʃ cn(t)∅n(x) = Ʃ cn(t=0)e^(-i*En*t/h)∅n(x) a. Find the formal expression of the coefficient cn(t=o) in terms of ∅n(x), and show the maths of your result by using the orthogonality of ∅n(x). 2. Relevant equations 3. The attempt at a solution Nothing, sadly. Thanks !!!!!