$\cot ^{-1}\left(\frac{1}{\sqrt{x^2-1}}\right), x>1$ का सरलतम रूप . . . . . . है।

  • A
    $-\operatorname{cosec}^{-1} x$
  • B
    $-\sec ^{-1} x$
  • C
    $\operatorname{cosec}^{-1} x$
  • D
    $\sec ^{-1} x$

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यदि $x < 1$ के लिए $f(x) = \frac{\sqrt{\operatorname{Cos}^{-1} x}}{\sqrt{2(1-x)}}$ है,तो $\lim_{x \rightarrow 1^{-}} f(x) =$

$\cot^{-1}(-\sqrt{3}) = $

यदि $\cos ^{-1}\left(\frac{1}{2}\right)=\cot \left(\cos ^{-1} x\right)$ है,तो $x$ का मान ज्ञात कीजिए।

$\tan ^{-1}\left(\frac{\cos \left(\frac{15 \pi}{4}\right)-1}{\sin \left(\frac{\pi}{4}\right)}\right)$ का मान किसके बराबर है?

$\cos ^{-1}\left(\cos \frac{13 \pi}{6}\right)+\tan ^{-1}\left(\tan \frac{7 \pi}{6}\right)=$ . . . . . . .

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