$\int \frac{3^x}{\sqrt{1-9^x}} d x=$

  • A
    $\sin ^{-1}\left(3^x\right) \cdot(\log 3)^{-1}+c$
  • B
    $-\sin ^{-1}\left(3^x\right) \cdot \log 3+c$
  • C
    $\frac{1}{3} \sin ^{-1}\left(3^x\right)+c$
  • D
    $\frac{1}{9} \sin ^{-1}\left(3^x\right)+c$

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