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

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

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Difficult
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