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RU-SPB 2021 Problem 114

  • Grade 11

The following functions are written on the board, F(x)=x2+12x2,G(x)=sin⁡(πx2),H(x)=1.F(x) = x^2 + \frac{12}{x^2}, G(x) = \sin(\pi x^2), H(x) = 1. If functions f,gf,g are currently on the board, we may write on the board the functions f(x)+g(x),f(x)−g(x),f(x)g(x),cf(x)f(x) + g(x), f(x) - g(x), f(x)g(x), cf(x) (the last for any real number cc ). Can a function h(x)h(x) appear on the board such that ∣h(x)−x∣<13|h(x) - x| < \frac{1}{3} for all x∈[1,10]x \in [1,10] ?

Dataset text AI-MO AoPS. Quoted with source.

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