$\tan ^{-1} \left( \frac{\cos x}{1-\sin x} \right)$,$-\frac{3 \pi}{2} < x < \frac{\pi}{2}$ को सरलतम रूप में व्यक्त कीजिए।

  • A
    $-\frac{\pi}{4} - \frac{x}{2}$
  • B
    $-\frac{\pi}{4} + \frac{x}{2}$
  • C
    $\frac{\pi}{4} - \frac{x}{2}$
  • D
    $\frac{\pi}{4} + \frac{x}{2}$

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$\cos ^{-1}\left\{\cot \left(\sum_{i=1}^3 \cot ^{-1} i\right)\right\}=$ . . . . . . .

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यदि $y = \operatorname{cosec}^{-1}\left[\frac{\sqrt{x}+1}{\sqrt{x}-1}\right] + \cos^{-1}\left[\frac{\sqrt{x}-1}{\sqrt{x}+1}\right]$ है,तो $\frac{dy}{dx} = $

केवल मुख्य मानों को ध्यान में रखते हुए,यदि $\tan (\cos ^{ - 1}x) = \sin [\cot ^{ - 1}(1/2)]$ है,तो $x$ का मान ज्ञात कीजिए।

$\cot \left(\sum\limits_{n=1}^{50} \tan ^{-1}\left(\frac{1}{1+n+n^{2}}\right)\right)$ का मान ज्ञात कीजिए।

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