$1+\cos^2 \theta = 3 \sin \theta \cos \theta \Rightarrow \theta = ?$

  • A
    $n\pi + \frac{\pi}{4}, n\pi + \tan^{-1}\left(\frac{1}{2}\right); n \in \mathbb{Z}$
  • B
    $n\pi - \frac{\pi}{4}, n\pi + \tan^{-1}(2); n \in \mathbb{Z}$
  • C
    $n\pi + \frac{\pi}{4}, n\pi + \tan^{-1}(2); n \in \mathbb{Z}$
  • D
    $n\pi - \frac{\pi}{4}, n\pi + \tan^{-1}\left(\frac{1}{2}\right); n \in \mathbb{Z}$

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$\sin 2x - \sin 4x + \sin 6x = 0$ ઉકેલો.

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