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If `tanA+tanB+tanC=tanAtanBtanC` then

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If `tanA+tanB+tanC=tanAtanBtanC` 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 thrid
C. A+B+C must be n integral multiple of `pi`
D. none of these
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Correct Answer - A
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