تابع با ضابطه $f\left( x \right)=\left\{ \begin{matrix}
\frac{\left| {{x}^{2}}-9 \right|}{x-3}\,\,\,\,\,\,\,\,\,\,\,\,\,;\,\,\,\,\,\,\,\,x\ne 3 \\
0\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,;\,\,\,\,\,\,\,\,x=3 \\
\end{matrix} \right.$ از نظر پیوستگی در نقطه $x=3$ چگونه است؟