4 3 2 a + a + a
a^4 + a^3 + a^2
/ ___\ / ___\ | 1 I*\/ 3 | | 1 I*\/ 3 | a*|a + - + -------|*|a + - - -------| \ 2 2 / \ 2 2 /
(a*(a + 1/2 + i*sqrt(3)/2))*(a + 1/2 - i*sqrt(3)/2)
2 / 2\ a *\1 + a + a /
a^2*(1 + a + a^2)
2 3 4 a + a + a
a^2 + a^3 + a^4
2 a *(1 + a*(1 + a))
a^2*(1 + a*(1 + a))