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## Homework Statement

let A be a lowering operator.

## Homework Equations

Show that A is a derivative respects to raising operator, A†,

A=d/dA†

## The Attempt at a Solution

I start by defining a function in term of A†, which is f(A†) and solve it using [A , f(A†)] but i get stuck after that. Can someone please explain briefly what i should do in the next step?