यदि $S = \{\theta \in [-\pi, \pi] : \cos \theta \cos \frac{5\theta}{2} = \cos 7\theta \cos \frac{7\theta}{2}\}$, तो $n(S)$ का मान . . . . . . है।

  • A
    $11$
  • B
    $12$
  • C
    $13$
  • D
    $14$

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