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