જો $\lim_{x}$ ${\rightarrow 0} \left\{ \frac{1}{x^{8}} \left( 1 - \cos \frac{x^{2}}{2} - \cos \frac{x^{2}}{4} + \cos \frac{x^{2}}{2} \cos \frac{x^{2}}{4} \right) \right\} = 2^{-k}$ હોય,તો $k$ ની કિંમત શોધો.

  • A
    $-8$
  • B
    $8$
  • C
    $10$
  • D
    $-10$

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