______ 2*x3 + acos(3*x) + \/ 9*x2
2*x3 + acos(3*x) + sqrt(9*x2)
-3 ------------- __________ / 2 \/ 1 - 9*x
-27*x ------------- 3/2 / 2\ \1 - 9*x /
/ 2 \ | 27*x | -27*|1 + --------| | 2| \ 1 - 9*x / ------------------ 3/2 / 2\ \1 - 9*x /