/ x \ -x*y |y - -*(x + y)|*--------- \ y / 3 2 x - x*y
(y - x/y*(x + y))*(((-x)*y)/(x^3 - x*y^2))
2 - y + x*(x + y) ---------------- 2 2 x - y
(-y^2 + x*(x + y))/(x^2 - y^2)
/ x*(x + y)\ -x*y*|y - ---------| \ y / --------------------- 3 2 x - x*y
-x*y*(y - x*(x + y)/y)/(x^3 - x*y^2)
/ 2 \ -x*\y - x*(x + y)/ -------------------- 3 2 x - x*y
-x*(y^2 - x*(x + y))/(x^3 - x*y^2)
/ 2 \ -\y - x*(x + y)/ ------------------ 2 2 x - y
-(y^2 - x*(x + y))/(x^2 - y^2)
2 2 x - y + x*y --------------- (x + y)*(x - y)
(x^2 - y^2 + x*y)/((x + y)*(x - y))
/ x*(x + y)\ -x*y*|y - ---------| \ y / --------------------- 3 2 x - x*y
-x*y*(y - x*(x + y)/y)/(x^3 - x*y^2)
/ x*(x + y)\ -x*y*|y - ---------| \ y / --------------------- 3 2 x - x*y
-x*y*(y - x*(x + y)/y)/(x^3 - x*y^2)