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Mathematics
Mathematics
Problem
For the function
f
(
x
)
=
{
x
,
x
<
0
∣
x
∣
,
x
≥
0
f(x)=\begin{cases}x, & x<0\\ |x|, & x\ge 0\end{cases}
f
(
x
)
=
{
x
,
∣
x
∣
,
x
<
0
x
≥
0
, find its range.
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