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(e^(-0.4*x))'The calculation above is a derivative of the function f (x)

e^(-0.4*x)*((-0.4*x)'*ln(e)+(-0.4*x*(e)')/e)

e^(-0.4*x)*((-0.4*x)'*ln(e)+(-0.4*x*0)/e)

e^(-0.4*x)*(((-0.4)'*x-0.4*(x)')*ln(e)+(-0.4*x*0)/e)

e^(-0.4*x)*((0*x-0.4*(x)')*ln(e)+(-0.4*x*0)/e)

e^(-0.4*x)*((0*x-0.4*1)*ln(e)+(-0.4*x*0)/e)

e^(-0.4*x)*((-0.4*x*0)/e-0.4*ln(e))

e^((-0.4)'*x-0.4*(x)')

e^(0*x-0.4*(x)')

e^(0*x-0.4*1)

0^(-0.4*x)

-0.4*e^(-0.4*x)

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