यदि $\theta = \tan^{-1}\left(\frac{1}{3}\right) + \tan^{-1}\left(\frac{1}{7}\right) + \tan^{-1}\left(\frac{1}{13}\right) + \tan^{-1}\left(\frac{1}{21}\right) + \tan^{-1}\left(\frac{1}{31}\right)$,तो $\tan \theta =$

  • A
    $\frac{3}{5}$
  • B
    $1$
  • C
    $\frac{5}{7}$
  • D
    $\frac{7}{9}$

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$2{\tan ^{ - 1}}\frac{1}{3} + {\tan ^{ - 1}}\frac{1}{2} = $

समीकरण $\sin \left[ \cot^{-1} (1 + x) \right] = \cos \left[ \tan^{-1} x \right]$ को संतुष्ट करने वाला $x$ का मान है

सिद्ध कीजिए कि $3 \cos ^{-1} x = \cos ^{-1} (4 x^{3} - 3 x)$,जहाँ $x \in [\frac{1}{2}, 1]$.

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