If satisfies for all

MATHEMATICS · Subjective · AoPS · Mathematics · Functions · Functions

Problem

If y=f(x)y=f(x) satisfies f(x−1)+f(x+1)=3f(x)f(x-1)+f(x+1)=\sqrt{3}f(x) for all x∈Rx\in\mathbb{R}, is f(x)f(x) periodic?

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