MaxValue[|[1/2*(erf(x/sqrt(2))+1)]-[1/2*(tanh(2/sqrt(pi)*(x/sqrt(2)+11/123*(x/sqrt(2))^3))+1)]|,x]MaxValue[|[1/2*(erf(x/sqrt(2))+1)]-[1/2*(tanh(2/sqrt(pi)*(x/sqrt(2)+11/123*(x/sqrt(2))^3))+1)]|,x]

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