A) Is continuous at \[x=0\]
B) Is differentiable at \[(3,\,\,1)\]
C) Does not exist
D) None of these
Correct Answer: C
Solution :
\[\underset{x\to 0}{\mathop{\lim }}\,\,\cos \frac{1}{x}\] oscillates between \[-1\] and 1. \ Limit doesn?t exist.
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