\[\underset{x\to 0}{\mathop{\lim }}\,\frac{\cos ax-\cos bx}{{{x}^{2}}}=\] [AI CBSE 1988]

\[\frac{{{a}^{2}}-{{b}^{2}}}{2}\]

\[\frac{{{b}^{2}}-{{a}^{2}}}{2}\]

\[\underset{x\to 0}{\mathop{\lim }}\,\frac{\cos ax-\cos bx}{{{x}^{2}}}

1.	\[\underset{x\to 0}{\mathop{\lim }}\,\frac{\cos ax-\cos bx}{{{x}^{2}}}=\] [AI CBSE 1988]
A.	\[\frac{{{a}^{2}}-{{b}^{2}}}{2}\]
B.	\[\frac{{{b}^{2}}-{{a}^{2}}}{2}\]
C.	\[{{a}^{2}}-{{b}^{2}}\]
D.	\[{{b}^{2}}-{{a}^{2}}\]
Answer» C. \[{{a}^{2}}-{{b}^{2}}\]

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\[\underset{x\to 0}{\mathop{\lim }}\,\frac{\cos ax-\cos bx}{{{x}^{2}}}=\] [AI CBSE 1988]

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