$\begin{aligned} & \text{यदि } \cot \left(\cos ^{-1} x\right)=\sec \left\{\tan ^{-1}\left(\frac{a}{\sqrt{b^2-a^2}}\right)\right\} \\ & b>a, \text{ तो } x= \end{aligned}$

  • A
    $\frac{b}{\sqrt{2 b^2-a^2}}$
  • B
    $\frac{\sqrt{b^2-a^2}}{a b}$
  • C
    $\frac{a}{\sqrt{2 b^2-a^2}}$
  • D
    $\frac{\sqrt{b^2-a^2}}{a}$

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यदि $y = \cos^2 [\cot^{-1} (\sqrt{\frac{1-x}{1+x}})]$ है, तो $\frac{dy}{dx} = \dots$

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