prove

Asked by  | 14th Sep, 2012, 11:31: AM

Expert Answer:

 

It is known that a/sin A = b/sin B = c/sin C.

Let a/sin A = b/sin B = c/sin C = k

Or, sin A = a/k, sin B = b/k and sin C = c/k                                          … (1) 

 

Now, a cos A + b cos B + c cos C

Hence, proved

Answered by  | 14th Sep, 2012, 01:00: PM

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