$\lim _{x \rightarrow 0} \frac{\cos ax - \cos bx}{x^{2}}$ का मान ज्ञात कीजिए।

  • A
    $\frac{a^{2} - b^{2}}{2}$
  • B
    $\frac{b^{2} - a^{2}}{2}$
  • C
    $a^{2} - b^{2}$
  • D
    $b^{2} - a^{2}$

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