3.0 + x - x^2 - 1/y - x*y - 3.0*y/x
3 / 2 2 3\ 3 2 - 3*y + x*\-y + 3*y + x*y - x*y / - x *y -------------------------------------------- 2 x*y
2 / 2\ 3 - 3*y + x*\-1 + 3*y + x*y - x*y / - y*x ----------------------------------------- x*y
/ 2 3 2 2 2 \ -\x + 3*y + y*x + x *y - y*x - 3*x*y/ ------------------------------------------ x*y