$\sum_{k=0}^{12} \frac{1}{\sin \left((k+1) \frac{\pi}{6}+\frac{\pi}{4}\right) \sin \left(\frac{k \pi}{6}+\frac{\pi}{4}\right)} = $

  • A
    $2(\sqrt{3}+1)$
  • B
    $2(3-\sqrt{3})$
  • C
    $2(2-\sqrt{3})$
  • D
    $2(\sqrt{3}-1)$

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