यदि $\cos ^{-1} 2x + \cos ^{-1} 3x = \frac{\pi}{3}$ है, तो $x =$

  • A
    $\frac{\sqrt{3}}{2\sqrt{7}}$
  • B
    $\frac{\sqrt{3}}{\sqrt{7}}$
  • C
    $\frac{\sqrt{2}}{\sqrt{5}}$
  • D
    $\frac{\sqrt{3}}{2\sqrt{5}}$

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$2 \cot ^{-1} \frac{1}{2} - \cot ^{-1} \frac{4}{3}$ का मान है

$2 \tan ^{-1}\left(\frac{1}{3}\right)+\cos ^{-1}\left(\frac{3}{5}\right)=$

$\tan ^{-1} 2 + \tan ^{-1} 3$ का मान क्या है?

सिद्ध कीजिए कि $\tan ^{-1} x+\tan ^{-1} \frac{2 x}{1-x^{2}}=\tan ^{-1}\left(\frac{3 x-x^{3}}{1-3 x^{2}}\right)$,जहाँ $|x| < \frac{1}{\sqrt{3}}$.

$x$ का वह मान जो $\sin \left(\cot ^{-1} x\right)=\cos \left(\tan ^{-1}(1+x)\right)$ को संतुष्ट करता है, है

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