/ ___\
|\/ 2 |
|-----|
\ 2 /
-----------------
______________
/ 2
\/ 1 - (1 - x)
$$\frac{\frac{1}{2} \sqrt{2}}{\sqrt{1 - \left(1 - x\right)^{2}}}$$
___
\/ 2 *(-1 + x)
-------------------
3/2
/ 2\
2*\1 - (1 - x) /
$$\frac{\sqrt{2} \left(x - 1\right)}{2 \left(1 - \left(1 - x\right)^{2}\right)^{\frac{3}{2}}}$$
/ 2 \
___ | 3*(-1 + x) |
-\/ 2 *|-1 + -------------|
| 2|
\ -1 + (1 - x) /
----------------------------
3/2
/ 2\
2*\1 - (1 - x) /
$$- \frac{\sqrt{2} \left(\frac{3 \left(x - 1\right)^{2}}{\left(1 - x\right)^{2} - 1} - 1\right)}{2 \left(1 - \left(1 - x\right)^{2}\right)^{\frac{3}{2}}}$$