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## Homework Statement

a=g.[(M-m)/(M+m)]

how do i go about finding the partial derivative wrt m?

## Homework Equations

## The Attempt at a Solution

i started by rearranging it to the form a=g.(M-m)(M+m)^-1, i used the chain rule to find the derivative of (M+m)^-1 to be -(M+m)^-2 but i'm not sure where to go from there or even if that was the right approach to take. any help?

thanks