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Mathematics
Problem
Define the signum function
sgn
(
x
)
\operatorname{sgn}(x)
sgn
(
x
)
and state its value for (i)
x
<
0
x<0
x
<
0
, (ii)
x
=
0
x=0
x
=
0
, and (iii)
x
>
0
x>0
x
>
0
.
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