$\tan \,{20^o}\cot \,{10^o}\cot \,{50^o}$ is equal to

  • A

    $\frac{1}{{\sqrt 3 }}$

  • B

    $\sqrt 3 $

  • C

    $\frac{{\sqrt 3 }}{4}$

  • D

    $4\sqrt 3 $

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