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