x^2 - x - 1/x + (1 + 2*x)/(1 + x + x^2)
2 1 1 + 2*x x - x - - + ---------- x 2 1 + x + x
5 -1 + x -------------- / 2\ x*\1 + x + x /
(-1 + x^5)/(x*(1 + x + x^2))
/ 2 3 4\ (-1 + x)*\1 + x + x + x + x / ------------------------------- / 2\ x*\1 + x + x /
(-1 + x)*(1 + x + x^2 + x^3 + x^4)/(x*(1 + x + x^2))
2 2 -1 + x x - x + ----------- 2 3 x + x + x
x^2 - x + (-1 + x^2)/(x + x^2 + x^3)
5 -1 + x ----------------- x*(1 + x*(1 + x))
(-1 + x^5)/(x*(1 + x*(1 + x)))