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**1. The problem statement, all variables and given/known data**

Evaluate [x, SinPx] given [x, Px]=ih

**2. Relevant equations**

Px = h/I( d/dx)

**3. The attempt at a solution**

Let f (x) be a function of x.[ x, Sin Px ] f( x) ⇒ [ x sin{( h / i )d / dx} f ( x ) -Sin { (h/i) d / dx } x f(x)] . Does anybody concur .