3 5 y - y
y^3 - y^5
(x + 1)*x*(x - 1)
((x + 1)*x)*(x - 1)
3 -y *(1 + y)*(-1 + y)
-y^3*(1 + y)*(-1 + y)
3 / 2\ y *\1 - y /
y^3*(1 - y^2)