यदि $\sin 6 \theta = 32 \cos^5 \theta \sin \theta - 32 \cos^3 \theta \sin \theta + 3x$ है,तो $x$ का मान ज्ञात कीजिए:

  • A
    $\cos \theta$
  • B
    $\cos 2 \theta$
  • C
    $\sin \theta$
  • D
    $\sin 2 \theta$

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$\sqrt{2 + \sqrt{2 + 2\cos 4\theta}} = $

$\cos ^4 \frac{\pi}{8}+\cos ^4 \frac{3 \pi}{8}+\cos ^4 \frac{5 \pi}{8}+\cos ^4 \frac{7 \pi}{8}=$

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