4 c - 81
c^4 - 1*81
1*(c + 3)*(c - 3)*(c + 3*I)*(c - 3*I)
(((1*(c + 3))*(c - 3))*(c + 3*i))*(c - 3*i)
-81.0 + c^4
/ 2\ (-3 + c)*(3 + c)*\9 + c /
(-3 + c)*(3 + c)*(9 + c^2)