यदि $\cot ^{-1}(\sqrt{\cos \alpha})-\tan ^{-1}(\sqrt{\cos \alpha})=x$ है,तो $\sin x$ का मान है

  • A
    $\cot ^2 \frac{\alpha}{2}$
  • B
    $\cot \frac{\alpha}{2}$
  • C
    $\tan \frac{\alpha}{2}$
  • D
    $\tan ^2 \frac{\alpha}{2}$

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