यदि $2 \operatorname{Tanh}^{-1} x = \operatorname{Sinh}^{-1}\left(\frac{4}{3}\right)$ है, तो $\operatorname{Cosh}^{-1}\left(\frac{1}{x}\right) = $

  • A
    $\log (\sqrt{2}+1)$
  • B
    $\log (\sqrt{2}-1)$
  • C
    $\log (2+\sqrt{3})$
  • D
    $\log (2-\sqrt{3})$

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$2 \pi - \left(\sin ^{-1} \frac{4}{5} + \sin ^{-1} \frac{5}{13} + \sin ^{-1} \frac{16}{65}\right)$ का मान ज्ञात कीजिए।

यदि $\sec ^{-1} \frac{x}{a}-\sec ^{-1} \frac{x}{b}=\sec ^{-1} b-\sec ^{-1} a$ है,तो $x$ का मान ज्ञात कीजिए।

$\cot ^{-1}\left(2 \cdot 1^2\right)+\cot ^{-1}\left(2 \cdot 2^2\right)+\cot ^{-1}\left(2 \cdot 3^2\right)+\ldots \ldots \ldots \infty =$

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