tan(2\theta) = \pm \sqrt{3} \\ 2\theta = 60^\circ, (180^\circ-60^\circ), 240^\circ, 300^\circ, -(180^\circ-60^\circ), -60^\circ, -300^\circ, -240^\circ \\ \therefore \theta = 30, 60, 120, 150, -60, -30, -150, -120 \\ (\pm 30, \pm 60, \pm 120, \pm 150)
I think that's correct I'm not too sure.