4 3 x + 3*x - 1 ------------- 2 (x + 1)
(-1.0 + x^4 + 3.0*x^3)/(1.0 + x)^2
3 -1 + x *(3 + x) --------------- 2 (1 + x)
2 2 + 5*x -3 + x + x + ------------ 2 1 + x + 2*x