1 x*atan(x) ----------- + ----------- ________ ________ / 2 / 2 \/ 1 + x \/ 1 + x
/ 2 \ | x | -|-1 + ------|*atan(x) | 2| \ 1 + x / ----------------------- ________ / 2 \/ 1 + x
2 / 2 \ x | x | 1 - ------ + 3*x*|-1 + ------|*atan(x) 2 | 2| 1 + x \ 1 + x / -------------------------------------- 3/2 / 2\ \1 + x /