A function \( f(x) \) is defined as below \[f(x)=\frac{\cos (\sin x)-\cos x}{x^{2}}, x \neq 0 \t...

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A function \( f(x) \) is defined as below
\[f(x)=\frac{\cos (\sin x)-\cos x}{x^{2}}, x \neq 0 \text { and } f(0)=a \text {. }\]
\( f(x) \) is continuous at \( x=0 \) if \( a \) equals
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