$\lim _{x \rightarrow \frac{\pi}{2}} \frac{1+\cos 2 x}{\cot 3 x\left(3^{\sin 2 x}-1\right)}=$

  • A
    $\frac{1}{3 \log 9}$
  • B
    $\frac{2}{3 \log 3}$
  • C
    $\frac{1}{3 \log 3}$
  • D
    $\frac{3}{\log 3}$

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