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