$\cot^{-1} \frac{3}{4} + \sin^{-1} \frac{5}{13} = $

  • A
    $\sin^{-1} \frac{63}{65}$
  • B
    $\sin^{-1} \frac{12}{13}$
  • C
    $\sin^{-1} \frac{65}{68}$
  • D
    $\sin^{-1} \frac{5}{12}$

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यदि $\sin ^{-1}\left(\frac{x}{13}\right)+\operatorname{cosec}^{-1}\left(\frac{13}{12}\right)=\frac{\pi}{2}$ है,तो $x$ 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:

$4 \tan^{-1} \frac{1}{5} - \tan^{-1} \frac{1}{70} + \tan^{-1} \frac{1}{99} = $

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