4 2 - y - 3*y + 4
-y^4 - 3*y^2 + 4
4 2 4 - y - 3*y
4 - y^4 - 3*y^2
(x + 1)*(x - 1)*(x + 2*I)*(x - 2*I)
(((x + 1)*(x - 1))*(x + 2*i))*(x - 2*i)
2 / 2\ 4 + y *\-3 - y /
4 + y^2*(-3 - y^2)
/ 2\ -(1 + y)*(-1 + y)*\4 + y /
-(1 + y)*(-1 + y)*(4 + y^2)
4.0 - y^4 - 3.0*y^2