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# Reference Angles and Angles in the Unit Circle

## Formed between the terminal side of an angle and the closest part of the x-axis.

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## Reference Angles

Definition of reference angle shown on the unit circle
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## Reference Angles and Special Angles

Definition of reference angle shown on the unit circle
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## SLT 3: Extend the def of sine from a right triangle ratio to a function of an angle of rotation

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