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Suppose that $f$ is an invertible function from $(-\infty,\infty)$ to $(-\infty,\infty)$. If $f(f(x))=x$, find $f(x)-f^{-1}(x)$.

 Jul 31, 2020
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f(x)-f^{-1}(x) = 2x

 Aug 14, 2020

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