$\lim _{x \rightarrow 0} \frac{\cos (m x)-\cos (n x)}{x^2} =$

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

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