$\int \frac{3^x(x \log 3-1)}{x^2} d x=$

  • A
    $\frac{3^x}{x}+c$
  • B
    $\frac{3^x}{x^2}+c$
  • C
    $x \cdot 3^x+c$
  • D
    $x^2 3^x+c$

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