यदि $\cos \theta - \sin \theta = \sqrt{2} \sin \theta$ है, तो $\cos \theta + \sin \theta$ का मान ज्ञात कीजिए।

  • A
    $\sqrt{2} \cos \theta$
  • B
    $\sqrt{2} \sin \theta$
  • C
    $2 \cos \theta$
  • D
    $-\sqrt{2} \cos \theta$

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माना $S = \{ \theta \in [0, 4\pi] : \tan^2 \theta \neq 1 \}$ और $S = \{ a \in \mathbb{Z} : 2(\cos^8 \theta - \sin^8 \theta) \sec 2\theta = a^2, \theta \in S \}$ है। तो $n(S)$ है:

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