જો $\cos \frac{\pi}{4} \cos \frac{\pi}{8} \cos \frac{\pi}{16} \cos \frac{\pi}{32} = 2^m \operatorname{cosec} \frac{\pi}{n}$ હોય,તો $m+n=$

  • A
    $27$
  • B
    $25$
  • C
    $28$
  • D
    $29$

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

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