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Mathematics
Problem
What is the range of the function
f
(
x
)
=
s
g
n
(
x
)
f(x)=\mathrm{sgn}(x)
f
(
x
)
=
sgn
(
x
)
? a)
{
−
1
,
1
}
\{-1,1\}
{
−
1
,
1
}
b)
R
\mathbb{R}
R
c)
{
−
1
,
0
,
1
}
\{-1,0,1\}
{
−
1
,
0
,
1
}
d)
[
0
,
∞
)
[0,\infty)
[
0
,
∞
)
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