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OpenStudy (anonymous):

Prove the following system of linear equations using elementary (right angle trigonometry) in cosA, cosB, and cosC for the triangle shown (note: side b is opposite angle B, side a is opposite angle A, and side c is opposite angle C). ccosB + bcosC = a ccosA + acosC = b bcosA + acosB = c

OpenStudy (anonymous):

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