$$\frac{2}{4 t^{2} + 1}$$
-16*t
-----------
2
/ 2\
\1 + 4*t /
$$- \frac{16 t}{\left(4 t^{2} + 1\right)^{2}}$$
/ 2 \
| 16*t |
16*|-1 + --------|
| 2|
\ 1 + 4*t /
------------------
2
/ 2\
\1 + 4*t /
$$\frac{\frac{256 t^{2}}{4 t^{2} + 1} - 16}{\left(4 t^{2} + 1\right)^{2}}$$