/ 3 ___ 5/6\ / 3 ___ 5/6\
/ 3 ___\ | \/ 3 I*3 | | \/ 3 I*3 |
1*\x - \/ 3 /*|x + ----- + ------|*|x + ----- - ------|
\ 2 2 / \ 2 2 /
((1*(x - 3^(1/3)))*(x + (3^(1/3)/2 + i*3^(5/6)/2)))*(x + (3^(1/3)/2 - i*3^(5/6)/2))