/ ___\ x*atan\\/ x / - 1
x*atan(sqrt(x)) - 1
___ \/ x / ___\ --------- + atan\\/ x / 2*(1 + x)
___ 3 2*\/ x ----- - ------- ___ 1 + x \/ x --------------- 4*(1 + x)
___ 3 \/ x 1 - ------ + -------- - ------------- 3/2 2 ___ 8*x (1 + x) \/ x *(1 + x) ----------------------------------- 1 + x