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A Proof of the Cosine Addition Formula Using the Law of Cosines

Patrik Nystedt
Mathematics Magazine
Vol. 87, No. 2 (April 2014), p. 144
DOI: 10.4169/math.mag.87.2.144
Stable URL: http://www.jstor.org/stable/10.4169/math.mag.87.2.144
Page Count: 1
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Abstract

Summary We give a proof of the cosine addition formula using the law of cosines.

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