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## Homework Statement

show that [x,f(p_x)] = i [itex]\hbar[/itex] d/d(p_x) f(p_x)

## Homework Equations

x is the position operator in the x direction, p_x is the momentum operator; i [itex]\hbar[/itex]

d/dx

[x, p_x]=xp-px

## The Attempt at a Solution

I'm stuck. maybe chain rule for d/dx and d/d(p_x)...? But I don't see how I'd do it...