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

Lesson 4: Topic B: Trigonometry and triangles- Solving for a side with the law of sines
- Solving for an angle with the law of sines
- Solve triangles using the law of sines
- Proof of the law of sines
- Solving for a side with the law of cosines
- Solving for an angle with the law of cosines
- Solve triangles using the law of cosines
- Proof of the law of cosines
- Trig word problem: stars
- General triangle word problems

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# Solve triangles using the law of sines

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