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Question

If A+B+C = pi, then prove that tan A+ tan B+ tan C = tan A . tan B . tan C

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Solution

A+B+C = πA+B = π-CtanA+B =tan π-CtanA+tanB1-tanAtanB= -tanCtanA+tanB= -tanC+tanAtanBtanCtanA+tanB+tanC= tanAtanBtanC

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