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### Course: Precalculus (Eureka Math/EngageNY) > Unit 4

Lesson 2: Topic A: Lessons 3-4: Addition and subtraction formulas- Trig angle addition identities
- Using the cosine angle addition identity
- Using the cosine double-angle identity
- Using the trig angle addition identities
- Proof of the sine angle addition identity
- Proof of the cosine angle addition identity
- Finding trig values using angle addition identities
- Find trig values using angle addition identities

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