12 10 6 4 x + x + x + x + 1 ----------------------- 1 / 3 \ \x + x + 1/
4 6 10 12 1 + x + x + x + x ----------------------- 3 1 + x + x
(1.0 + x^4 + x^6 + x^10 + x^12)/(1.0 + x + x^3)
4 / 2 / 4 / 2\\\ 1 + x *\1 + x *\1 + x *\1 + x /// --------------------------------- / 2\ 1 + x*\1 + x /
2 4 9 2 6 3 2 + 3*x + 3*x -1 + x + x - x - x - 2*x + 2*x + -------------- 3 1 + x + x