मान ज्ञात कीजिए: $\operatorname{cosec}^{-1}\left[\left(\frac{\tan ^2\left(\frac{\alpha-\pi}{4}\right)-1}{\tan ^2\left(\frac{\alpha-\pi}{4}\right)+1}+\cos \frac{\alpha}{2} \cdot \cot 5 \alpha\right) \sec \frac{11 \alpha}{2}\right]$

  • A
    $2 \alpha$
  • B
    $5 \alpha$
  • C
    $\frac{\pi}{2}-4 \alpha$
  • D
    $\frac{5}{2} \alpha$

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