$\frac{\tan 40^{\circ}+\tan 20^{\circ}}{1-\cot 70^{\circ} \cot 50^{\circ}}$ का मान किसके बराबर है?

  • A
    $\sqrt{3}$
  • B
    $\sqrt{2}$
  • C
    $\frac{1}{\sqrt{3}}$
  • D
    $\frac{1}{\sqrt{2}}$

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Difficult
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$\frac{{\tan A + \sec A - 1}}{{\tan A - \sec A + 1}} = $

यदि $\tan A = \frac{1}{2}$ है,तो $\tan 3A = $

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