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(1, 0)
0 or 2\pi
(0, 1)
\frac{\pi}{2}
(-1, 0)
\pi
(0, -1)
\frac{3\pi}{2}
(\frac{\sqrt{2}}{2}, \frac{\sqrt{2}}{2})
\frac{\pi}{4}
(\frac{\sqrt{3}}{2}, \frac{1}{2})
\frac{\pi}{6}
(\frac{1}{2}, \frac{\sqrt{3}}{2})
\frac{\pi}{3}
(-\frac{\sqrt{2}}{2}, \frac{\sqrt{2}}{2})
\frac{3\pi}{4}
(-\frac{1}{2}, \frac{\sqrt{3}}{2})
\frac{2\pi}{3}
(-\frac{\sqrt{3}}{2}, -\frac{1}{2})
\frac{4\pi}{3}
(-\frac{\sqrt{2}}{2}, -\frac{\sqrt{2}}{2})
\frac{5\pi}{4}
(-\frac{1}{2}, -\frac{\sqrt{3}}{2})
\frac{7\pi}{6}
(\frac{1}{2}, -\frac{\sqrt{3}}{2})
\frac{5\pi}{3}
(\frac{\sqrt{3}}{2}, -\frac{1}{2})
\frac{11\pi}{6}
(-\frac{\sqrt{2}}{2}, -\frac{\sqrt{2}}{2})
\frac{7\pi}{4}
(-\frac{\sqrt{3}}{2},\frac{1}{2})
\frac{5\pi}{6}