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(a) Show that the commutator [Pz, X- = -2iha. (b) Use the generalized Ehrenfest theorem and the result of part to find an expression for

(a) Show that the commutator [Pz, X- = -2iha. (b) Use the generalized Ehrenfest theorem and the result of part to find an expression for d(Pr) /dt in a one-dimensional system wit the Hamiltonian operator H CX 2m

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