1 ------ 6 1 + x
1/(1 + x^6)
1/(3*(1 + x^2)) - (-2 + x^2)/(3*(1 + x^4 - x^2))
2 1 -2 + x ---------- - --------------- / 2\ / 4 2\ 3*\1 + x / 3*\1 + x - x /
1/(1.0 + x^6)
1 ---------------------- / 2\ / 4 2\ \1 + x /*\1 + x - x /
1/((1 + x^2)*(1 + x^4 - x^2))