fun-lim

Question: $\underset{x\to 0}{\mathop{\lim }}\,\frac{\cos ax-\cos bx}{{{x}^{2}}}=$



1) $\frac{{{a}^{2}}-{{b}^{2}}}{2}$
2) $\frac{{{b}^{2}}-{{a}^{2}}}{2}$
3) ${{a}^{2}}-{{b}^{2}}$
4) ${{b}^{2}}-{{a}^{2}}$
Solution: Explanation: No Explanation
Limits

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