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