$\lim _{x}$ ${\rightarrow 0} 2\left(\frac{1-\cos x \sqrt{\cos 2 x} \sqrt[3]{\cos 3 x} \ldots \sqrt[10]{\cos 10 x}}{x^2}\right)$ का मान ............ है।

  • A
    $56$
  • B
    $55$
  • C
    $57$
  • D
    $60$

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