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

  • A
    $m/n$
  • B
    $n/m$
  • C
    $\frac{m^2}{n^2}$
  • D
    $\frac{n^2}{m^2}$

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