दिए गए सीमा (limit) का मान ज्ञात कीजिए: $\mathop {\lim }\limits_{x \to 0} \frac{\cos 2x - 1}{\cos x - 1}$

  • A
    $2$
  • B
    $4$
  • C
    $1$
  • D
    $0$

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$\mathop {\lim }\limits_{x \to 0} \frac{{1 - \cos 2x}}{x} = $

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