4 x - 3*x
x^4 - 3*x
/ 3 ___ 5/6\ / 3 ___ 5/6\ / 3 ___\ | \/ 3 I*3 | | \/ 3 I*3 | x*\x - \/ 3 /*|x + ----- + ------|*|x + ----- - ------| \ 2 2 / \ 2 2 /
((x*(x - 3^(1/3)))*(x + 3^(1/3)/2 + i*3^(5/6)/2))*(x + 3^(1/3)/2 - i*3^(5/6)/2)
/ 3\ x*\-3 + x /
x*(-3 + x^3)
x^4 - 3.0*x