/ _________\ atan\\/ 6*x - 1 /
atan(sqrt(6*x - 1))
1 --------------- _________ 2*x*\/ 6*x - 1
/1 3 \ -|- + --------| \x -1 + 6*x/ ---------------- __________ 2*x*\/ -1 + 6*x
1 27 3 -- + ------------- + ------------ 2 2 x*(-1 + 6*x) x 2*(-1 + 6*x) --------------------------------- __________ x*\/ -1 + 6*x