4 2 y + y - 2
y^4 + y^2 - 2
2 4 -2 + y + y
-2 + y^2 + y^4
/ ___\ / ___\ (x + 1)*(x - 1)*\x + I*\/ 2 /*\x - I*\/ 2 /
(((x + 1)*(x - 1))*(x + i*sqrt(2)))*(x - i*sqrt(2))
/ 2\ (1 + y)*(-1 + y)*\2 + y /
(1 + y)*(-1 + y)*(2 + y^2)
-2.0 + y^2 + y^4
2 / 2\ -2 + y *\1 + y /
-2 + y^2*(1 + y^2)