poblem 11.13cies wx # 0, express the angular momentum operatorl, in terms of creationand annihilation operators. Consider the limiting transition to the isotropic case.For a two-dimensional harmonic oscillator in the xy-plane with different frequen-and show that this operator becomes a constant of motion, in agreementwith Section 11.6.OProve that I mn = Vn 2^n! SmnFind fow I Yes> =L[21>+i12>e-iwtFind < Pp> for1 Yes>Find the time-deperden t uncert arty laHint APe) = -

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