11-22 Unit Circle & Trig. Functions

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Define the Unit Circle.

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A circle with a radius of 1 centered at the origin of the coordinate plane, used to define trigonometric functions.

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What is the sine of an angle in the unit circle?

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The y-coordinate of the point on the unit circle corresponding to that angle.

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What is the cosine of an angle in the unit circle?

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The x-coordinate of the point on the unit circle corresponding to that angle.

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What is the tangent of an angle in the unit circle?

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