/ 3 ___\ / 3 ___ 5/6\ / 3 ___ 5/6\ | \/ 3 | | \/ 3 I*3 | | \/ 3 I*3 | x*|x + -----|*|x + - ----- + ------|*|x + - ----- - ------| \ 3 / \ 6 6 / \ 6 6 /
((x*(x + 3^(1/3)/3))*(x - 3^(1/3)/6 + i*3^(5/6)/6))*(x - 3^(1/3)/6 - i*3^(5/6)/6)
/ 3\ x*\1 + 9*x /
x*(1 + 9*x^3)