If \( f(x)=\left\{\begin{array}{l}\frac{x}{\sin 3 x}, \text { when } x \neq 0 \\ 3, \text { when...

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If \( f(x)=\left\{\begin{array}{l}\frac{x}{\sin 3 x}, \text { when } x \neq 0 \\ 3, \text { when } x=0\end{array}\right. \), find whether or not, \( f(x) \) is continuous at \( x=0 \).
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