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