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