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this integral can be solved
S e^-4x(5+e^-2x) dx
S5e^(-4x)+ e^-4x *e^-2x dx
sorry due to time limit i cannot solve it properly
we can solve this by substitution
dv =e^(-2x)/2 dx
so the integral becomes
S 5e^(-2x)^2dx+ e^-2x e^-4xdx
-10v^2/2 -2v^3/3 +C
-5v^2 -2/3 v^3 +C
-5e^-4x -2/3 e^-6x +C is the solution of the integral
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