2 2 / 3 \ 2*x *y*\x *-y/
2*x^2*y*(x^3*(-y))^2
1*(x + 0)*(y + 0)
(1*(x + 0))*(y + 0)
8 3 2*x *y
2*x^8*y^3
2.0*x^8*y^3