Let x0∈(0,∞)x0∈(0,∞) be the value of x∈(0,∞)x∈(0,∞) that maximizes the function f:(0,∞)→Rf:(0,∞)→R defined by  f(x):=lnx/xf(x):=ln⁡x/x for every x∈(0,∞),x∈(0,∞),  and y0:=f(x0)y0:=f(x0) be the value of this maximum. Then the product x0y0x0y0 is

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