5
--------------
2
1 + (5*x - 8) $$\frac{5}{\left(5 x - 8\right)^{2} + 1}$$
-50*(-8 + 5*x)
------------------
2
/ 2\
\1 + (-8 + 5*x) / $$- \frac{250 x - 400}{\left(\left(5 x - 8\right)^{2} + 1\right)^{2}}$$
/ 2 \
| 4*(-8 + 5*x) |
250*|-1 + ---------------|
| 2|
\ 1 + (-8 + 5*x) /
--------------------------
2
/ 2\
\1 + (-8 + 5*x) / $$\frac{\frac{1000 \left(5 x - 8\right)^{2}}{\left(5 x - 8\right)^{2} + 1} - 250}{\left(\left(5 x - 8\right)^{2} + 1\right)^{2}}$$