(3*a - 2*b)*(a + 2*b)
/ 2*b\ 1*(a + 2*b)*|a - ---| \ 3 /
(1*(a + 2*b))*(a - 2*b/3)
2 2 - 4*b + 3*a + 4*a*b
-4*b^2 + 3*a^2 + 4*a*b
(a + 2.0*b)*(3.0*a - 2.0*b)