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# Tangent Sum and Difference Formulas

## Tangent of a sum or difference related to a set of tangent functions.

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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.
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## Tangent Sum and Difference Formulas

Derivation of the tangent sum and difference formulas

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• Video

## Sum and Difference Identities for Tangent

Uses the sum and difference tangent identities to determine values of functions.

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• Practice
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