17. If A, B, C are angles of a triangle, prove thatA+B(ii) cos A4 B = – InterviewSolution

1.	17. If A, B, C are angles of a triangle, prove thatA+B(ii) cos A4 B = sin(ii) cos(1) sin (A + B) = sin Ctan (B+C) + tan (C+ A) + tan (A+B)tan (It - A) + tan (2 - B) + tan (31-C)
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