3 z - 1
z^3 - 1*1
/ ___\ / ___\ | 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))
-1.0 + z^3
/ 2\ (-1 + z)*\1 + z + z /
(-1 + z)*(1 + z + z^2)