Extend the domain of trigonometric functions using the unit circle.
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Understand radian measure of an angle as the length of the arc on any circle subtended by the angle, measured in units of the circle's radius.
Explain how the unit circle in the coordinate plane enables the extension of sine and cosine functions to all real numbers, interpreted as radian measures of angles traversed counterclockwise around the unit circle.
Extend the domain of trigonometric functions using the unit circle