3 x *atan(x)
3 x 2 ------ + 3*x *atan(x) 2 1 + x
/ 3 \ | x 3*x | 2*x*|3*atan(x) - --------- + ------| | 2 2| | / 2\ 1 + x | \ \1 + x / /
/ 3 5 \ | 10*x 4*x 9*x | 2*|3*atan(x) - --------- + --------- + ------| | 2 3 2| | / 2\ / 2\ 1 + x | \ \1 + x / \1 + x / /