atan(x + 5)
d --(atan(x + 5)) dx
-2*(5 + x)
---------------
2
/ 2\
\1 + (5 + x) /
/ 2 \
| 4*(5 + x) |
2*|-1 + ------------|
| 2|
\ 1 + (5 + x) /
---------------------
2
/ 2\
\1 + (5 + x) /