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

  • A
    $4$
  • B
    $6$
  • C
    $5$
  • D
    $9$

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