Question

Find dy/dx by implicit differentiation.

tan(x−y)=y/(1+x)^2

write the answer so it doesn't contain tan(x-y)

I am stuck on writing the answer so it doesn't have tan(x-y)

I got to the point where

dy/dx = [sec^2(x-y)(1+x)^2+2xy]/[1-x^2+sec(x-y)^2]