If \( f(x)=\left\{\begin{array}{ll}\frac{\tan 3 x}{\mathrm{kx}}, & x \neq 0 \\ 1, & x=0\end{arra...

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If \( f(x)=\left\{\begin{array}{ll}\frac{\tan 3 x}{\mathrm{kx}}, & x \neq 0 \\ 1, & x=0\end{array}\right. \), find \( \mathrm{k} \) so that the function \( f \) may be continuous it \( x=0 \) ?
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