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((e^-1*x)/x)'The calculation above is a derivative of the function f (x)

((e^-1*x)'*x-(e^-1*x*(x)'))/(x^2)

(((e^-1)'*x+e^-1*(x)')*x-(e^-1*x*(x)'))/(x^2)

((0*x+e^-1*(x)')*x-(e^-1*x*(x)'))/(x^2)

((0*x+e^-1*1)*x-(e^-1*x*(x)'))/(x^2)

(e^-1*x-(e^-1*x*(x)'))/(x^2)

(e^-1*x-(e^-1*x*1))/(x^2)

0

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