Question: Two operators can be applied to a function in succession. By definition, AB f(x) = A [B f(x)]. Evaluate AB f(x) if A = d

Two operators can be applied to a function in succession. By definition, ÂB̂ f(x) = Â [B̂ f(x)]. Evaluate ÂB̂ f(x) if Â = d /dx, B̂ = x, and f (x) = cos x.

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