$\int \frac{dx}{\sqrt{9-8x-4x^2}} = $ . . . . . . + $C$

  • A
    $\frac{1}{2} \sin^{-1} (\frac{8x-9}{9})$
  • B
    $\frac{1}{9} \sin^{-1} (\frac{9x-8}{8})$
  • C
    $\frac{1}{3} \sin^{-1} (\frac{9x-8}{8})$
  • D
    $\frac{1}{2} \sin^{-1} (\frac{2x+2}{\sqrt{13}})$

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