Show that the function \( f(x)=\left\{\begin{array}{cc}x^{m} \sin \left(\frac{1}{x}\right), & x ...

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Show that the function \( f(x)=\left\{\begin{array}{cc}x^{m} \sin \left(\frac{1}{x}\right), & x \neq 0 \\ 0 & , x=0\end{array}\right. \) i
is neither continuous nor differentiable, if \( m \leq 0 \)
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