3 a - 27
a^3 - 1*27
/ ___\ / ___\ | 3 3*I*\/ 3 | | 3 3*I*\/ 3 | 1*(a - 3)*|a + - + ---------|*|a + - - ---------| \ 2 2 / \ 2 2 /
((1*(a - 3))*(a + (3/2 + 3*i*sqrt(3)/2)))*(a + (3/2 - 3*i*sqrt(3)/2))
-27.0 + a^3
/ 2 \ (-3 + a)*\9 + a + 3*a/
(-3 + a)*(9 + a^2 + 3*a)