((b-sqrt3(b))/(sqrt3(b)+sqrt3(b^2)))
= -(b^(1/3)(1-b^(2/3))/b^(1/3)(1+b^(1/3)) = -((1-b^(1/3))(1+b^(1/3)))/(1+b^(1/3))= =b^(1/3) - 1 = sqrt3(b) - 1