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