જો ${\cos ^{ - 1}}\left( {\frac{1}{x}} \right) = \theta $ હોય,તો $\tan \theta =$

  • A
    $\frac{1}{{\sqrt {{x^2} - 1} }}$
  • B
    $\sqrt {{x^2} + 1} $
  • C
    $\sqrt {1 - {x^2}} $
  • D
    $\sqrt {{x^2} - 1} $

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

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