Find all partial derivatives?

Question

v = (xy)/(x-y)

vxx=
vxy=
vyx=
vyy=

Answer 1

vx = -y^2/(x-y)^2
vy = x^2/(x-y)^2

vxx = 2y^2/(x-y)^3
vyy = 2x^2/(x-y)^3

vxy = vyx = -2xy/(x-y)^3

Answer 2

v=xy/x-y