જો ${\sin ^{ - 1}}x + {\cot ^{ - 1}}\left( {\frac{1}{2}} \right) = \frac{\pi }{2}$ હોય,તો $x$ ની કિંમત શોધો.

  • A
    $0$
  • B
    $\frac{1}{{\sqrt 5 }}$
  • C
    $\frac{2}{{\sqrt 5 }}$
  • D
    $\frac{{\sqrt 3 }}{2}$

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$\cosh \left(\sinh ^{-1}(\sqrt{8})+\cosh ^{-1} 5\right)=$

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કિંમત શોધો: $\cos ^{-1}\left(\frac{4}{5}\right)+\cos ^{-1}\left(\frac{12}{13}\right)$

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