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If $b+c=3a,$ then $cot \large\frac{B}{2}$$ \cot \large\frac{C}{2}$ is equal to :

\[\begin {array} {1 1} (a)\;3 & \quad (b)\;1 \\ (c)\;4 & \quad (d)\;2 \end {array}\]

1 Answer

(d) 2
answered Nov 7, 2013 by pady_1
 

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