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0 votes
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in Trigonometry by (15 points)
edited by

a2CosA+b2CosB+c2CosC=abc/8

by (10.9k points)
The given identity is not satisfied as for example for an equilateral triangle we  can put a=b=c=2 and A=B=60degree.
we get LHS=6 and RHS=1

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