Maths
\begin{eqnarray}
f(x) = \left\{
\begin{array}{ll} x & x \geq 0 \\
0 & x < 0 \end{array}
\right.
\end{eqnarray}
(1)
\begin{eqnarray} f(x) = \left\{ \begin{array}{ll} x & x \geq 0 \\ 0 & x < 0 \end{array} \right. \end{eqnarray}
(2)
\begin{eqnarray} f(x) = \left\{ \begin{array}{ll} x & x \geq 0 \\ 0 & x < 0 \end{array} \right. \end{eqnarray}
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