Find all polynomials $f(x)$, for which $f(x)f(2x^2)=f(2x^3+x)$.
I have no idea how to do it.
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$\begingroup$ I think this question should be reopened, as this question was closed as being a duplicate of this current one. (So a "good" question is a duplicate of a "bad" question...) $\endgroup$ – user1729 Jan 24 '18 at 13:49
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