$tan\,\, 20^o + tan\,\, 40^o + \sqrt 3\,\,  tan\,\, 20^o tan\,\, 40^o$ is equal to

  • A

    $\frac{{\sqrt 3 }}{2}$

  • B

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

  • C

    $\sqrt 3$

  • D

    $1$

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