यदि $\frac{1}{2} \leq x \leq 1$ है,तो $\cos ^{-1} x+\cos ^{-1}\left(\frac{x}{2}+\frac{1}{2} \sqrt{3-3 x^2}\right)$ का मान ज्ञात कीजिए।

  • A
    $\frac{\pi}{6}$
  • B
    $\frac{\pi}{3}$
  • C
    $\pi$
  • D
    $0$

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यदि $\tan ^{-1} x+\tan ^{-1} y+\tan ^{-1} z=\frac{\pi}{2}$ है,तो $1-x y-y z-z x$ का मान ज्ञात कीजिए।

$\cot \left(\sum_{n=1}^{23} \cot ^{-1}\left(1+\sum_{k=1}^n 2 k\right)\right)$ का मान ज्ञात कीजिए।

यदि $\tan ^{-1} x + \tan ^{-1} y + \tan ^{-1} z = \frac{\pi}{2}$,जहाँ $x, y, z > 0$ और $xy < 1$ है,तो $xy + yz + zx$ का मान ज्ञात कीजिए:

$\sec ^2(\tan ^{-1} 2)+\operatorname{cosec}^2(\cot ^{-1} 3) = $ . . . . . . .

यदि ${\tan ^{ - 1}}\frac{{x - 1}}{{x + 2}} + {\tan ^{ - 1}}\frac{{x + 1}}{{x + 2}} = \frac{\pi }{4}$,तो $x =$

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