4 2 - x - x - 1
-x^4 - x^2 - 1
2 4 -1 - x - x
-1 - x^2 - x^4
/ ___\ / ___\ / ___\ / ___\ | 1 I*\/ 3 | | 1 I*\/ 3 | | 1 I*\/ 3 | | 1 I*\/ 3 | |x + - + -------|*|x + - - -------|*|x + - - + -------|*|x + - - - -------| \ 2 2 / \ 2 2 / \ 2 2 / \ 2 2 /
(((x + 1/2 + i*sqrt(3)/2)*(x + 1/2 - i*sqrt(3)/2))*(x - 1/2 + i*sqrt(3)/2))*(x - 1/2 - i*sqrt(3)/2)
/ 2\ / 2 \ -\1 + x + x /*\1 + x - x/
-(1 + x + x^2)*(1 + x^2 - x)
-1.0 - x^2 - x^4
2 / 2\ -1 + x *\-1 - x /
-1 + x^2*(-1 - x^2)