Let \( f(x)=\left\{\begin{array}{ll}x^{2}\left|\cos \frac{\pi}{x}\right|, & x \neq 0 \\ 0, & x=0...

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Let \( f(x)=\left\{\begin{array}{ll}x^{2}\left|\cos \frac{\pi}{x}\right|, & x \neq 0 \\ 0, & x=0\end{array}, x \in R\right. \) then \( f \) is differentiable or not at \( \mathrm{x}=0 \)
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