Question

Multivariable calc: v= xy / (x-y). Find fxy

Answer 1

\[v=\frac{xy}{x-y}\] find \[v_{xy}\]

Answer 2

\[v_x = -y^2(x-y)^{-2}\]

Answer 3

\[v_{xy} = \frac{-2y}{(x-y)^2}+\frac{2y^2}{(x-y)^3}\]
Not really sure what I'm doing wrong here. I imagine it's a negative sign somewhere since that has been the majority of my mistakes so far, but can't find my error.