Question: *8. Let f : R > R be a function satisfying f(f(a:)) = 2f(a:) a: for any a: e R. Prove or disprove that f

*8. Let f : R > R be a function satisfying
*8. Let f : R > R be a function satisfying f(f(a:)) = 2f(a:) a: for any a: e R. Prove or disprove that f is injective

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