3 3 c + d
c^3 + d^3
/ / ___\\ / / ___\\ | |1 I*\/ 3 || | |1 I*\/ 3 || 1*(c + d)*|c - d*|- - -------||*|c - d*|- + -------|| \ \2 2 // \ \2 2 //
((1*(c + d))*(c - d*(1/2 - i*sqrt(3)/2)))*(c - d*(1/2 + i*sqrt(3)/2))
/ 2 2 \ (c + d)*\c + d - c*d/
(c + d)*(c^2 + d^2 - c*d)