x*atan(7*x)
7*x --------- + atan(7*x) 2 1 + 49*x
/ 2 \ | 49*x | 14*|1 - ---------| | 2| \ 1 + 49*x / ------------------ 2 1 + 49*x
/ 2 \ | 49*x | 2744*x*|-1 + ---------| | 2| \ 1 + 49*x / ----------------------- 2 / 2\ \1 + 49*x /