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Mathematics
Problem
Identify the range of the function
f
(
x
)
=
sgn
(
x
)
f(x)=\operatorname{sgn}(x)
f
(
x
)
=
sgn
(
x
)
defined for all real
x
x
x
. a) [-1,1] b) \{-1,1\} c) \{-1,0,1\} d) \{0,1\}
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