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