$\operatorname{Arg}\left(\sin \frac{6 \pi}{5}+i\left(1+\cos \frac{6 \pi}{5}\right)\right)=$

  • A
    $\frac{5 \pi}{6}$
  • B
    $\frac{6 \pi}{5}$
  • C
    $\frac{2 \pi}{5}$
  • D
    $\frac{9 \pi}{10}$

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