$\int {\frac{{{3^x}}}{{\sqrt {{9^x} - 1} }}\,dx} $

  • A
    $\frac{1}{{\log 3}}\log |{3^x} + \sqrt {{9^x} - 1} | + c$
  • B
    $\frac{1}{{\log 3}}\log |{9^x} + \sqrt {{9^x} - 1} | + c$
  • C
    $\frac{1}{{\log 9}}\log |{3^x} + \sqrt {{9^x} - 1} | + c$
  • D
    $\frac{1}{{\log 9}}\log |{3^x} - \sqrt {{9^x} - 1} | + c$

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