$\frac{2}{\sqrt{2+\sqrt{2+\sqrt{2+2 \cos 4x}}}}$ का सरलतम रूप है

  • A
    $\sec \frac{x}{2}$
  • B
    $\sec x$
  • C
    $\operatorname{cosec} x$
  • D
    $1$

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