यदि $\cot^{-1}[(\cos \alpha)^{1/2}] - \tan^{-1}[(\cos \alpha)^{1/2}] = x$ है,तो $\sin x = $

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

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