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Prove that: (1+ cos (A-B) cos C)/(1+ cos...

Prove that: `(1+ cos (A-B) cos C)/(1+ cos (A-C) cos B) = (a^(2) +b^(2))/(a^(2) + c^(2))`

Text Solution

Verified by Experts

The correct Answer is:
`(a^(2) +b^(2))/(a^(2) +c^(2)) - (a^(2))/(4R^(2)) +(c^(2))/(4R^(2))`
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