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