यदि $A+B+C=180^{\circ}$ है,तो $\tan \left(\frac{A+B}{2}\right)=$ ...........

  • A
    $\cot \left(\frac{A+B}{2}\right)$
  • B
    $\cot \frac{C}{2}$
  • C
    $\sec \frac{C}{2}$
  • D
    $\sin \frac{A}{2}$

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$2 \sin ^{2} 30^{\circ} \cot 30^{\circ}-3 \cos ^{2} 60^{\circ} \sec ^{2} 30^{\circ} = \dots$

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