fjnction oleh bagian lateks
|x| =
\left\{
\begin{array}{ll}
x & \mbox{if } x \geq 0 \\
-x & \mbox{if } x < 0
\end{array}
\right.
Vast Vole
|x| =
\left\{
\begin{array}{ll}
x & \mbox{if } x \geq 0 \\
-x & \mbox{if } x < 0
\end{array}
\right.