मान लीजिए $S = \left\{ \theta \in \left( 0, \frac{\pi}{2} \right) : \sum_{m=1}^{9} \sec \left( \theta + (m-1) \frac{\pi}{6} \right) \sec \left( \theta + \frac{m \pi}{6} \right) = -\frac{8}{\sqrt{3}} \right\}$. तो:

  • A
    $S = \left\{ \frac{\pi}{12} \right\}$
  • B
    $S = \left\{ \frac{2 \pi}{3} \right\}$
  • C
    $\sum_{\theta \in S} \theta = \frac{\pi}{2}$
  • D
    $\sum_{\theta \in S} \theta = \frac{3 \pi}{4}$

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