જો $y=\cos ^{-1}\left(\frac{6 x-2 x^2-4}{2 x^2-6 x+5}\right)$ હોય, તો $\frac{d y}{d x}=$

  • 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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