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If $b+c=3a,$ then $cot \large\frac{B}{2}$$ \cot \large\frac{C}{2}$ is equal to :
\[\begin {array} {1 1} (a)\;3 & \quad (b)\;1 \\ (c)\;4 & \quad (d)\;2 \end {array}\]
jeemain
eamcet
math
2006
q32
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Nov 6, 2013
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meena.p
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(d) 2
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Nov 7, 2013
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pady_1
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