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(1, 0)
π/6
Quadrant I
π/4
Quadrant I
π/3
Quadrant I
π/2
(0, 1)
2π/3
Quadrant II
3π/4
Quadrant II
5π/6
Quadrant II
π
(-1, 0)
7π/6
Quadrant III
5π/4
Quadrant III
4π/3
Quadrant III
3π/2
(0, -1)
5π/3
Quadrant IV
7π/4
Quadrant IV
11π/6
Quadrant IV