Identify the range of the function defined for all real .

MATHEMATICS · Single correct · AoPS · Mathematics · Special Functions · Special Functions

Problem

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

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