1. The problem statement, all variables and given/known data Does Px Lx operators commute? 2. Relevant equations This is just me wondering 3. The attempt at a solution I tried doing this and I got something weird, my friend said that when you take a derviative with respect z or something that when you try to take the derivative of something that's not with respect to z it goes to 0. Is this true? p.s. im not very good at math.