4 y - 16
y^4 - 16
(x + 2)*(x - 2)*(x + 2*I)*(x - 2*I)
(((x + 2)*(x - 2))*(x + 2*i))*(x - 2*i)
/ 2\ (-2 + y)*(2 + y)*\4 + y /
(-2 + y)*(2 + y)*(4 + y^2)
-16.0 + y^4