-2*x
-----------
________
/ 4
\/ 1 - x
$$- \frac{2 x}{\sqrt{1 - x^{4}}}$$
/ 4 \
| 2*x |
-2*|1 + ------|
| 4|
\ 1 - x /
---------------
________
/ 4
\/ 1 - x
$$- \frac{2 \left(\frac{2 x^{4}}{1 - x^{4}} + 1\right)}{\sqrt{1 - x^{4}}}$$
/ 4 \
3 | 6*x |
-4*x *|5 + ------|
| 4|
\ 1 - x /
------------------
3/2
/ 4\
\1 - x /
$$- \frac{4 x^{3} \left(\frac{6 x^{4}}{1 - x^{4}} + 5\right)}{\left(1 - x^{4}\right)^{\frac{3}{2}}}$$