-4
-----------
________
/ 2
\/ 1 - x
$$- \frac{4}{\sqrt{- x^{2} + 1}}$$
-4*x
-----------
3/2
/ 2\
\1 - x /
$$- \frac{4 x}{\left(- x^{2} + 1\right)^{\frac{3}{2}}}$$
/ 2 \
| 3*x |
-4*|1 + ------|
| 2|
\ 1 - x /
---------------
3/2
/ 2\
\1 - x /
$$- \frac{\frac{12 x^{2}}{- x^{2} + 1} + 4}{\left(- x^{2} + 1\right)^{\frac{3}{2}}}$$