atan(2*x - 3)
d --(atan(2*x - 3)) dx
2
--------------
2
1 + (2*x - 3)
-8*(-3 + 2*x)
------------------
2
/ 2\
\1 + (-3 + 2*x) /
/ 2 \
| 4*(-3 + 2*x) |
16*|-1 + ---------------|
| 2|
\ 1 + (-3 + 2*x) /
-------------------------
2
/ 2\
\1 + (-3 + 2*x) /