Unit Circle
Unit Circle
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Unit circle
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Unit circle
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Khan AcademySal Khan
The unit circle is a circle with a radius of 1, centered at the origin of a coordinate plane. It plays a central role in trigonometry because every point on the unit circle corresponds to an angle and its sine and cosine values. If you take an angle measured from the positive x-axis, the coordinates of the point where the terminal side of that angle intersects the circle are exactly (cos θ, sin θ). This makes the unit circle a powerful tool for understanding the behavior of trigonometric functio
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