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If $f(x)= \begin{cases}\frac{\cos a x-\cos b x}{x^2}, & x \neq 0 \\ \frac{1}{2}\left(a^2-b^2\right) & , x=0\end{cases}$
where $a, b$ are real and district constants, then
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where $a, b$ are real and district constants, then
Solution:
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Verified Answer
The correct answer is:
$f$ is discontinuous at $x=0$
No solution. Refer to answer key.
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