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# Double Angle Identities

## Simplifying trigonometric functions with twice a given angle.

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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.

## Double Angle Identities

by CK-12 //at grade
Derivation of double angle identities for sine, cosine, and tangent
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## Double, Half, and Power Reducing Identities

by CK-12 //at grade
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## Double, Half, and Power Reducing Identities

by Caitlin Polzin //at grade
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## Double Angle Formulas

by EPISD Precalculus Team //at grade
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• PLIX

## Double Angle Identities: Ferris Wheel

by CK-12 //at grade
Double Angle Identities Interactive
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• Video

## Double Angle Identities

by CK-12 //at grade
Uses the double-angle identities to determine values of functions.
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