समुच्चय $S = \{\theta \in [-4\pi, 4\pi] : 3 \cos^2 2\theta + 6 \cos 2\theta - 10 \cos^2 \theta + 5 = 0\}$ में अवयवों की संख्या है

  • A
    $32$
  • B
    $33$
  • C
    $34$
  • D
    $35$

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