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# Trigonometric Functions and Angles of Rotation

## Based on the unit circle.

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.
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## Trigonometric Functions and Angles of Rotation

by CK-12 //at grade
Describing trig functions as relationships on the unit circle
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• PLIX

## The Triangle in the Circle

by CK-12 //at grade
Trigonometric Functions and Angles of Rotation Interactive
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• Video

## Determine Trigonometric Function Values Using the Unit Circle

by CK-12 //at grade
Uses the unit circle to determine values of trigonometric functions.
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