7*acos(x)
d --(7*acos(x)) dx
-7 ----------- ________ / 2 \/ 1 - x
-7*x ----------- 3/2 / 2\ \1 - x /
/ 2 \ | 3*x | 7*|-1 + -------| | 2| \ -1 + x / ---------------- 3/2 / 2\ \1 - x /