acos(5*x)
d --(acos(5*x)) dx
-5 -------------- ___________ / 2 \/ 1 - 25*x
-125*x
--------------
3/2
/ 2\
\1 - 25*x /
/ 2 \
| 75*x |
-125*|1 + ---------|
| 2|
\ 1 - 25*x /
--------------------
3/2
/ 2\
\1 - 25*x /