જો $\frac{d}{d x}\left\{\frac{2}{\sqrt{2+\sqrt{2+\sqrt{2+2 \cos (4 x)}}}}\right\} = k \sec \left(\frac{x}{2}\right) \tan \left(\frac{x}{2}\right)$ હોય,તો $k$ ની કિંમત શોધો.

  • A
    $\frac{1}{2}$
  • B
    $2$
  • C
    $1$
  • D
    $\frac{1}{8}$

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