3 a + 64
a^3 + 64
/ ___\ / ___\ (a + 4)*\a + -2 + 2*I*\/ 3 /*\a + -2 - 2*I*\/ 3 /
((a + 4)*(a - 2 + 2*i*sqrt(3)))*(a - 2 - 2*i*sqrt(3))
64.0 + a^3
/ 2 \ (4 + a)*\16 + a - 4*a/
(4 + a)*(16 + a^2 - 4*a)