54*(-1 + 3*x*atan(3*x))*atan(3*x) --------------------------------- 2 / 2\ \1 + 9*x /
/ 2 2 \ | 2 1 36*x *atan (3*x) 18*x*atan(3*x)| 162*|atan (3*x) - -------- - ---------------- + --------------| | 2 2 2 | \ 1 + 9*x 1 + 9*x 1 + 9*x / --------------------------------------------------------------- 2 / 2\ \1 + 9*x /