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

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A function \( f(x) \) is defined as below
\( \mathrm{P} \)
\( f(x)=\frac{\cos (\sin x)-\cos x}{x^{2}}, x \neq 0 \) and \( f(0)=a, f(x) \) is continuous at \( x=0 \) if ' \( a \) ' equals
(A) 0
(B) 4
(C) 5
(D) 6


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