यदि ${\cos ^{ - 1}}\left( {\frac{1}{x}} \right) = \theta $ है,तो $\tan \theta =$

  • 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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मान ज्ञात कीजिए: $\cos \left(\sec ^{-1} 2\right)+\tan \left(\cot ^{-1} \sqrt{3}\right)+\sin\left(\operatorname{cosec}^{-1} \frac{2}{\sqrt{3}}\right) = $ ?

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यदि $\cos ^{-1} x = \sin ^{-1}(3x)$ है,तो $x$ का मान ज्ञात कीजिए।

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माना $\mathop {Lim}\limits_{x \to 0} \sec^{-1} \left( \frac{x}{\sin x} \right) = l$ और $\mathop {Lim}\limits_{x \to 0} \sec^{-1} \left( \frac{x}{\tan x} \right) = m$,तो

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