यदि $y = \cot^{-1}(\cos 2x)^{1/2}$ है,तो $x = \frac{\pi}{6}$ पर $\frac{dy}{dx}$ का मान ज्ञात कीजिए।

  • A
    $\left(\frac{2}{3}\right)^{1/2}$
  • B
    $\left(\frac{1}{3}\right)^{1/2}$
  • C
    $\sqrt{3}$
  • D
    $\sqrt{6}$

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