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Linear operators play an important role in the quantum mechanical description of matter. Which of the following is true
of all linear operators, A and B?
A[k f(x)]=kÃƒ (x)
Ã[Ãƒ (x)]=Ãƒ(x) +Ãƒ (x)
A[Bf(x)]=B[Ãƒ(x)]
○ AB f(x)=B A f(x)

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