समीकरण $\cos^2 2x + \sin^2 3x = 1$ का हल समुच्चय क्या है?

  • A
    $\left\{x \mid x = n\pi + \frac{\pi}{2}, n \in \mathbb{Z}\right\}$
  • B
    $\left\{x \mid x = 2n\pi \pm \frac{\pi}{4}, n \in \mathbb{Z}\right\}$
  • C
    $\left\{x \mid x = \frac{n\pi}{5}, n \in \mathbb{Z}\right\}$
  • D
    $\left\{x \mid x = n\pi + (-1)^n \frac{\pi}{6}, n \in \mathbb{Z}\right\}$

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यदि $\cos 2x = (\sqrt{2}+1)(\cos x - \frac{1}{\sqrt{2}})$ और $\cos x \neq \frac{1}{\sqrt{2}}$,तो $x \in$

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