$\cot ^{-1}\left[\frac{\sqrt{1-\sin x}+\sqrt{1+\sin x}}{\sqrt{1-\sin x}-\sqrt{1+\sin x}}\right]$ का मान ज्ञात कीजिए,जहाँ $x \in\left(0, \frac{\pi}{4}\right)$ है।

  • A
    $\frac{x}{2}-\pi$
  • B
    $\pi-\frac{x}{3}$
  • C
    $\pi-\frac{x}{2}$
  • D
    $\frac{x}{2}$

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यदि $\operatorname{Tan}^{-1} \frac{1}{3}+\operatorname{Tan}^{-1} \frac{1}{7}+\operatorname{Tan}^{-1} \frac{1}{13}+\ldots+\operatorname{Tan}^{-1} \frac{1}{n^2+n+1}=\operatorname{Tan}^{-1} \theta$ है,तो $\theta=$

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