मान लीजिए $|\cos \theta \cos (60^{\circ}-\theta) \cos (60^{\circ}+\theta)| \leq \frac{1}{8}$, जहाँ $\theta \in [0, 2\pi]$ है। तो, उन सभी $\theta \in [0, 2\pi]$ का योग ज्ञात कीजिए जहाँ $\cos 3\theta$ अपना अधिकतम मान प्राप्त करता है: ($\pi$ में)

  • A
    $9$
  • B
    $18$
  • C
    $6$
  • D
    $15$

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यदि $A = \{x \in [0, 2\pi] : \tan x - \tan^2 x > 0\}$ और $B = \{x \in [0, 2\pi] : |\sin x| < \frac{1}{2}\}$,है,तो $A \cap B =$

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