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