The maximum value x of function y = 2x / X & # 178; + 1 is greater than 0

y=2x/(x²+1)=2/(x+1/x)
x> 0 x + 1 / X ≥ 2, the minimum value is 2
The maximum value of y = 2x / (X & # 178; + 1) = 2 / (x + 1 / x) is 1

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