x*atan(5*x)
5*x --------- + atan(5*x) 2 1 + 25*x
/ 2 \ | 25*x | 10*|1 - ---------| | 2| \ 1 + 25*x / ------------------ 2 1 + 25*x
/ 2 \ | 25*x | 1000*x*|-1 + ---------| | 2| \ 1 + 25*x / ----------------------- 2 / 2\ \1 + 25*x /