asin(4*x)
d --(asin(4*x)) dx
4 -------------- ___________ / 2 \/ 1 - 16*x
64*x
--------------
3/2
/ 2\
\1 - 16*x /
/ 2 \
| 48*x |
64*|1 + ---------|
| 2|
\ 1 - 16*x /
------------------
3/2
/ 2\
\1 - 16*x /