2 3 / 1\ x *|-3 + -| \ x/ ------------ 3 (-1 + 3*x)
x^3*(-3.0 + 1/x)^2/(-1.0 + 3.0*x)^3
2 x*(1 - 3*x) ------------ 3 (-1 + 3*x)
x -------- -1 + 3*x
1 1 - + -------- 3 -3 + 9*x