$\lim _{n}$ ${\rightarrow \infty} \frac{1}{n}\left[\sin \frac{\pi}{4}+\sin \frac{\pi}{12}\left(3+\frac{1}{n}\right)+\sin \frac{\pi}{12}\left(3+\frac{2}{n}\right)+\ldots+\sin \frac{\pi}{3}\right]=$

  • A
    $\frac{\sqrt{2}-1}{2 \sqrt{2}}$
  • B
    $\frac{6(\sqrt{2}-1)}{\pi}$
  • C
    $\frac{\sqrt{2}-1}{6 \pi}$
  • D
    $0$

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