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