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Prove
brijmohan123456
Nov 29, 2012, 07:10 AM
In triangle ABC 'a' is the side between B & C,b is the side between A & C and c is the side between A & B. prove that
a(cosC - cosB)=(b-c)(1+ cosA)
ebaines
Dec 1, 2012, 10:18 AM
The trick to this is to use the facts that a \cos C + c \cos A = b, and a \cos B + b \cos A = c.