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Khan Academy (English - US curriculum)
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Khan Academy (English - US curriculum)
Math by grade
Eureka Math/EngageNY
Geometry (Eureka Math/EngageNY)
Module 2: Similarity, proof, and trigonometry
Topic E: Lessons 32-33: Laws of sines and cosines
Proof of the law of cosines
Proof of the law of cosines
Sal gives a simple proof of the Law of cosines.
License: CC BY-NC-SA by Khan Academy