2 acos (3*x)
-6*acos(3*x) ------------- __________ / 2 \/ 1 - 9*x
/ 1 3*x*acos(3*x)\ -18*|--------- + -------------| | 2 3/2| |-1 + 9*x / 2\ | \ \1 - 9*x / /
/ 2 \ | acos(3*x) 9*x 27*x *acos(3*x)| 54*|- ------------- + ------------ - ---------------| | 3/2 2 5/2 | | / 2\ / 2\ / 2\ | \ \1 - 9*x / \-1 + 9*x / \1 - 9*x / /