(±23,0)\left(\pm \frac{2}{\sqrt{3}}, 0\right)(±32,0)
(±23,0)\left(\pm \sqrt{\frac{2}{3}}, 0\right)(±32,0)
(0,±3)(0, \pm \sqrt{3})(0,±3)
(0,±1)(0, \pm 1)(0,±1)