An electron in a hydrogen atom is, at a given instant, in a state described by the wavefunction
b(T=
x)-1201/+()1-()128+()001hp
using the notation ntm. (a) What is the expectation value of L^2? (b) What is the expectation value of the operator A = -i(LL,L, - L,LL)? Hint: use commutators.