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## Homework Statement

f is a function with an inverse and it is differentiable. Use f(f

^{-1}(x))=x

and come up with the formula for the derivative of f

^{-1}

## Homework Equations

## The Attempt at a Solution

I tried expanding that equation to f

^{'}(f

^{-1}(x))*f

^{'-1}(x) -x

but I tested this and it didn't work.

Thanks