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(x^3*e^(-4*x))'The calculation above is a derivative of the function f (x)
(x^3)'*e^(-4*x)+x^3*(e^(-4*x))'
3*x^(3-1)*e^(-4*x)+x^3*(e^(-4*x))'
3*x^2*e^(-4*x)+x^3*(e^(-4*x))'
3*x^2*e^(-4*x)+x^3*e^(-4*x)*((-4*x)'*ln(e)+(-4*x*(e)')/e)
3*x^2*e^(-4*x)+x^3*e^(-4*x)*((-4*x)'*ln(e)+(-4*x*0)/e)
3*x^2*e^(-4*x)+x^3*e^(-4*x)*(((-4)'*x-4*(x)')*ln(e)+(-4*x*0)/e)
3*x^2*e^(-4*x)+x^3*e^(-4*x)*((0*x-4*(x)')*ln(e)+(-4*x*0)/e)
3*x^2*e^(-4*x)+x^3*e^(-4*x)*((0*x-4*1)*ln(e)+(-4*x*0)/e)
3*x^2*e^(-4*x)+x^3*e^(-4*x)*((-4*x*0)/e-4*ln(e))
3*x^2*e^(-4*x)+x^3*e^((-4)'*x-4*(x)')
3*x^2*e^(-4*x)+x^3*e^(0*x-4*(x)')
3*x^2*e^(-4*x)+x^3*e^(0*x-4*1)
3*x^2*e^(-4*x)+x^3*0^(-4*x)
3*x^2*e^(-4*x)+x^3*-4*e^(-4*x)
3*x^2*e^(-4*x)-(4*x^3*e^(-4*x))
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