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شکل زیر نمودار کدام تابع است؟
1 )
$f\left( x \right)=\left\{ \begin{matrix} 1\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,1\le x\lt 2 \\ x\,\,\,\,\,\,\,\,\,-2\le x\lt 3 \\\end{matrix} \right.$
2 )
$f\left( x \right)=\left\{ \begin{matrix} x\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,1\le x\le 3 \\ 1\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,-2\le x\lt 1 \\\end{matrix} \right.$
$f\left( x \right)=\left\{ \begin{matrix}
x\,\,\,\,\,\,\,\,\,\,\,\,\,1\lt x\lt 3 \\
1\,\,\,\,\,\,\,\,\,\,\,\,\,-2\lt x\lt 1 \\
\end{matrix} \right.$
4 )
$f\left( x \right)=\left\{ \begin{matrix}
1\,\,\,\,\,\,\,\,\,\,\,\,\,1\lt x\lt 3 \\
x\,\,\,\,\,\,\,\,\,\,\,\,\,-2\le x\le 1 \\
\end{matrix} \right.$