$$x_{2} = \left(- \frac{1}{2} - \frac{\sqrt{3} i}{2}\right)^{2}$$
=
$$- \frac{1}{2} + \frac{\sqrt{3} i}{2}$$
=
-0.5 + 0.866025403784439*i
$$y_{2} = - \frac{1}{2} - \frac{\sqrt{3} i}{2}$$
=
$$- \frac{1}{2} - \frac{\sqrt{3} i}{2}$$
=
-0.5 - 0.866025403784439*i
$$x_{3} = \left(- \frac{1}{2} + \frac{\sqrt{3} i}{2}\right)^{2}$$
=
$$\frac{\left(1 - \sqrt{3} i\right)^{2}}{4}$$
=
-0.5 - 0.866025403784439*i
$$y_{3} = - \frac{1}{2} + \frac{\sqrt{3} i}{2}$$
=
$$- \frac{1}{2} + \frac{\sqrt{3} i}{2}$$
=
-0.5 + 0.866025403784439*i