/ / ___\\ / / ___\\ | | 1 I*\/ 3 || | | 1 I*\/ 3 || | 2*|- - - -------|| | 2*|- - + -------|| / 2\ | \ 2 2 /| | \ 2 2 /| |a - -|*|a - -----------------|*|a - -----------------| \ b/ \ b / \ b /
((a - 2/b)*(a - 2*(-1/2 - i*sqrt(3)/2)/b))*(a - 2*(-1/2 + i*sqrt(3)/2)/b)
/ 2 2 \ (-2 + a*b)*\4 + a *b + 2*a*b/
(-2 + a*b)*(4 + a^2*b^2 + 2*a*b)