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# Unit Circle

## Determine exact values of trig ratios for common radian measures

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.
• Video

## Unit Circle Definition of Trig Functions

by Apoorva Handigol //basic
In this great video, use the unit circle to define the sine, cosine, and tangent functions.
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• Study Guide

## The Unit Circle

by Wesley Woo //basic
Study guide for the unit circle.
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• Flashcards

## Trigonometric Ratios on the Unit Circle

by Kyle Bardman //basic
These flashcards will help you better understand Algebra II with Trigonometry Concepts.
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