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Consider a system with a pair of observable quantities A and B, whose commutation relations with...

Consider a system with a pair of observable quantities A and B,
whose commutation relations with the Hamiltonian take the form [H, A] = iwB, [H, B]=−iwA,
where w is some real constant.
Suppose that the expectation values of A and B are known at time t = 0.
Give formulas for the expectation values of A and B as a function of time.

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