In mathematics, an even function is a real function such that f ( − x ) = f ( x ) {\displaystyle f(-x)=f(x)} for every x {\displaystyle x} in its domain. Similarly, an odd function is a function such that f ( − x ) = − f ( x ) {\displaystyle f(-x)=-f(x)} for every x {\displaystyle x} in its domain.
In mathematics, an even function is a real function such that f ( − x ) = f ( x ) {\displaystyle f(-x)=f(x)} for every x {\displaystyle x} in its domain. Similarly, an odd function is a function such that f ( − x ) = − f ( x ) {\displaystyle f(-x)=-f(x)} for every x {\displaystyle x} in its domain.
Source: Wikipedia "Even and odd functions" · CC BY-SA 4.0
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