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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= pi`

B

`A + B + C= 2pi`

C

`A + B + C= npi`

D

`A + B + C= pi//2`

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The correct Answer is:
A
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