Not sure if this is a closed or open question. But the question is suppose $f[f(x)]=x^2+1$ then what is $f(x)$? Though the question does not refer to the domain let us suppose it is defined on $\Bbb R$.
Thanks.
2026-04-06 19:31:51.1775503911
Any chance for a solution of $f[f(x)]=x^2+1$?
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