/ _____\ atan\\/ 3*x /
atan(sqrt(3*x))
___ \/ 3 ----------------- ___ 2*\/ x *(1 + 3*x)
___ /1 6 \ -\/ 3 *|- + -------| \x 1 + 3*x/ --------------------- ___ 4*\/ x *(1 + 3*x)
___ / 3 1 1 \ 3*\/ 3 *|---------- + ---- + -------------| | 2 2 2*x*(1 + 3*x)| \(1 + 3*x) 8*x / ------------------------------------------- ___ \/ x *(1 + 3*x)