/ ___\ / ___\ ___ atan\\/ x / (1 + x)*atan\\/ x / - \/ x ----------- - --------------------------- x 2 x
/ ___\ ___ / ___\ atan\\/ x / - \/ x + (1 + x)*atan\\/ x / ----------- - ----------------------------- x 2 x
/ ___\ ___ / ___\ atan\\/ x / \/ x - (1 + x)*atan\\/ x / ----------- + --------------------------- x 2 x
atan(sqrt(x))/x - (-x^0.5 + (1.0 + x)*atan(sqrt(x)))/x^2
/ ___ / ___\\ 2 / ___\ x*\\/ x - (1 + x)*atan\\/ x // + x *atan\\/ x / ------------------------------------------------ 3 x
___ / ___\ / ___\ \/ x + x*atan\\/ x / - (1 + x)*atan\\/ x / ------------------------------------------- 2 x