$\int \frac{1}{\sqrt{8+2x-x^2}} dx =$

  • A
    $\frac{1}{3} \sin^{-1}\left(\frac{x-1}{3}\right)+c$
  • B
    $\sin^{-1}\left(\frac{x+1}{3}\right)+c$
  • C
    $\frac{1}{3} \sin^{-1}\left(\frac{x+1}{3}\right)+c$
  • D
    $\sin^{-1}\left(\frac{x-1}{3}\right)+c$

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