d/dx exp(-x^2/2) * abs (exp(-a*x) *(1+a*x)+exp(x*a)*(1-a*x) )/sqrt(e^(2*a*x)+e^(-2*a*x))d/dx exp(-x^2/2) * abs (exp(-a*x) *(1+a*x)+exp(x*a)*(1-a*x) )/sqrt(e^(2*a*x)+e^(-2*a*x))

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