$\frac{d}{d x}\left(\cos ^{-1}\left(\frac{4 x^3}{27}-x\right)\right)=$

  • A
    $\frac{3}{\sqrt{9-x^2}}$
  • B
    $\frac{1}{\sqrt{9-x^2}}$
  • C
    $\frac{-3}{\sqrt{9-x^2}}$
  • D
    $\frac{-1}{\sqrt{9-x^2}}$

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