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