x --*atan(3*x) 2 E
(x/E^2)*atan(3*x)
-2 -2 3*x*e atan(3*x)*e + -------- 2 1 + 9*x
/ 2 \ | 9*x | -2 6*|1 - --------|*e | 2| \ 1 + 9*x / -------------------- 2 1 + 9*x
/ 2 \ | 36*x | -2 54*x*|-4 + --------|*e | 2| \ 1 + 9*x / ------------------------ 2 / 2\ \1 + 9*x /