यदि $y=\cos ^{-1}\left(\frac{6 x-2 x^2-4}{2 x^2-6 x+5}\right)$ है,तो $\frac{d y}{d x}=$

  • A
    $\frac{2}{\sqrt{3 x-x^2-2}}$
  • B
    $\frac{2}{3 x-x^2-2}$
  • C
    $\frac{2}{\sqrt{2 x^2-6 x+5}}$
  • D
    $\frac{2}{2 x^2-6 x+5}$

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यदि $a > b > 0$ और $x$ न्यूनकोण है,तो $\frac{d}{dx} \left[ \cos^{-1} \left( \frac{b - a \cos x}{a - b \cos x} \right) \right] = $

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