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If tan alpha + tanB + tanC = tanA tanB t...

If `tan alpha + tanB + tanC = tanA tanB tanC`, 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 `pi`

D

None of these

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The correct Answer is:
C
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