Iftan A + tan B + tan C = tan A. tan B, ...

Iftan A + tan B + tan C = tan A. tan B, tan C, then (A) A,B,C must be angles of a triangle (B) the sum of any two of A,B,C is equal to the third (C) A+B+C must be n integral multiple of π (D) None of these 12. C, then -

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