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