Homework Statement
given a certain state |ψ> that is an eigenstate of L^2 and Lz
Calculate <Lx^2> and <Lx>
Homework Equations
L^2|ψ> = l(l+1)h^2
Lz|ψ> = mh|ψ>
Lx = YPz - ZPy
The Attempt at a Solution
<Lx^2> = (1/2)(h^2)[l(l+1)-(m1)^2]
for Lx i got
<Lx> = ∫ψ(YPz-ZPy)ψ dx