જો $f(x) = \cos x \cos 2x \cos 4x \cos 8x \cos 16x$ હોય, તો $f' \left( \frac{\pi}{4} \right) = $

  • A
    $\text{cosec} \left( \frac{\pi}{4} \right)$
  • B
    $\cos \left( \frac{\pi}{4} \right)$
  • C
    $\tan \left( \frac{\pi}{4} \right)$
  • D
    $0$

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