3 2 z - 2*z + 2*z - 1
z^3 - 2*z^2 + 2*z - 1
3 2 -1 + z - 2*z + 2*z
-1 + z^3 - 2*z^2 + 2*z
/ ___\ / ___\ | 1 I*\/ 3 | | 1 I*\/ 3 | (x - 1)*|x + - - + -------|*|x + - - - -------| \ 2 2 / \ 2 2 /
((x - 1)*(x - 1/2 + i*sqrt(3)/2))*(x - 1/2 - i*sqrt(3)/2)
-1.0 + z^3 + 2.0*z - 2.0*z^2
/ 2 \ (-1 + z)*\1 + z - z/
(-1 + z)*(1 + z^2 - z)
-1 + z*(2 + z*(-2 + z))