In any triangle ABC, prove that 1+cos(A-B)cosC/1+cos(A-C)cosB=a2+b2/a2+c2

Asked by  | 14th Sep, 2012, 11:07: AM

Expert Answer:

In triangle ABC, A + B + C = ?

So, A + B = ? - C and A + C = ? - B

Answered by  | 14th Sep, 2012, 01:24: PM

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