English: Let us take this L⃗_(operator)f(r) operating on say some ψ minus f(r)L⃗_(operator) on some ψ now L has derivatives with respect to θ and ϕ only.
Telugu: ఈ L⃗_(operator)f(r)  ఆపరేటింగ్ తీసుకుందాం, కొన్ని ψ మైనస్ f(r)L⃗_(operator).