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Rotation angle. Radian measure of angle

Angle of rotation
Place the initial ray on the positive xx-axis (initial side). A rotation is described by the second ray (terminal side). • Counterclockwise rotation — the angle is positive. • Clockwise — negative.
You may rotate “past” 360360^\circ — the angle is not limited to [0;360)[0^\circ;360^\circ)
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