Hi All, I just found this site and this is my first post here. I am working on getting my masters in polymer chemistry and started taking a class this semester which is pretty much all calculus and linear algebra and I just have a hard time with these subjects. I got a homework problem that I know how to do in theory, but in practice I just can't get it. The problem is 1. [[∂][/2]/[∂x], [e][/-ax]-(1/[x][/n]] 2. [AB]= 0 it commutes 3. I know if (AB)ψ - (BA)ψ = 0 it commutes but I am having trouble mainly with the integration of the second term. I believe the first term goes to [ψ*[∂][/∂x]ψ-[∂][/∂x]ψψ*] + Cψψ* but I don't know where to go from there. Any help is appreciated. Thanks all!