$\cot ^{-1}\left(\frac{1}{2}\right)+\cot ^{-1}\left(\frac{1}{3}\right)=$ . . . . . . .

  • A
    $-\frac{\pi}{4}$
  • B
    $\frac{\pi}{4}$
  • C
    $\frac{5 \pi}{4}$
  • D
    $\frac{3 \pi}{4}$

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

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