Define a function f(x) such that f(f(x)) = -x

Define a function f(x) such that f(f(x)) = -x

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\[f(x)=-|x|\]

\[f(f(x)) = -|-|x||\]\[f(f(-1)) \neq 1 \]

@Anwar
f(f(x)) = -(-x) = x :-P

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