Proof of the law of cosines | Trig identities and examples | Trigonometry | Khan Academy
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YouTubeKhan Academy
Proof of the law of cosines | Trig identities and examples | Trigonometry | Khan Academy
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:trig/x9e81a4f98389efdf:law-of-cosines/v/law-of-cosines Proof of the law of cosines to solve for a side of a triangle when 2 sides and an angle are known. Practice this lesson yourself on ...
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