4 x - x
x^4 - x
/ ___\ / ___\ | 1 I*\/ 3 | | 1 I*\/ 3 | 1*(x + 0)*(x - 1)*|x + - + -------|*|x + - - -------| \ 2 2 / \ 2 2 /
(((1*(x + 0))*(x - 1))*(x + (1/2 + i*sqrt(3)/2)))*(x + (1/2 - i*sqrt(3)/2))
/ 3\ x*\-1 + x /
x*(-1 + x^3)
/ 2\ x*(-1 + x)*\1 + x + x /
x*(-1 + x)*(1 + x + x^2)