If in a \( \triangle A B C, \tan A+\tan B+\tan C \) has the value 9...

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If in a \( \triangle A B C, \tan A+\tan B+\tan C \) has the value 9 then the value of \( \cot A \cdot \cot B \cdot \cot C \) is equal to
(a) 9
(b) 1
(c) \( \frac{1}{9} \)
(d) none of these
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