1. The problem statement, all variables and given/known data Hello All, The professor asked us to prove that L+ = L1 + iL2, Please Help!, I have no Idea how to proceed, Any insight will be highly appreciated. 2. Relevant equations L+ = L1+iL2=~he^iφ (∂/∂θ + i cotθ ∂/∂φ) 3. The attempt at a solution L+ = L1+iL2=~he^iφ (∂/∂θ + i cotθ ∂/∂φ) .