asin(7*x)
d --(asin(7*x)) dx
7 -------------- ___________ / 2 \/ 1 - 49*x
343*x
--------------
3/2
/ 2\
\1 - 49*x /
/ 2 \
| 147*x |
343*|1 + ---------|
| 2|
\ 1 - 49*x /
-------------------
3/2
/ 2\
\1 - 49*x /