/ _____\ atan\\/ 5*x /
atan(sqrt(5*x))
___ \/ 5 ----------------- ___ 2*\/ x *(1 + 5*x)
___ /1 10 \ -\/ 5 *|- + -------| \x 1 + 5*x/ --------------------- ___ 4*\/ x *(1 + 5*x)
___ / 25 3 5 \ \/ 5 *|---------- + ---- + -------------| | 2 2 2*x*(1 + 5*x)| \(1 + 5*x) 8*x / ----------------------------------------- ___ \/ x *(1 + 5*x)