-2*x E *atan(3*x)
E^(-2*x)*atan(3*x)
-2*x -2*x 3*e - 2*atan(3*x)*e + -------- 2 1 + 9*x
/ 6 27*x \ -2*x 2*|- -------- + 2*atan(3*x) - -----------|*e | 2 2| | 1 + 9*x / 2\ | \ \1 + 9*x / /
/ / 2 \ \ | | 36*x | | | 27*|-1 + --------| | | | 2| | | 18 \ 1 + 9*x / 162*x | -2*x 2*|-4*atan(3*x) + -------- + ------------------ + -----------|*e | 2 2 2| | 1 + 9*x / 2\ / 2\ | \ \1 + 9*x / \1 + 9*x / /