4*x
-----------
________
/ 4
\/ 1 - x
$$\frac{4 x}{\sqrt{1 - x^{4}}}$$
/ 4 \
| 2*x |
-4*|-1 + -------|
| 4|
\ -1 + x /
-----------------
________
/ 4
\/ 1 - x
$$- \frac{4 \left(\frac{2 x^{4}}{x^{4} - 1} - 1\right)}{\sqrt{1 - x^{4}}}$$
/ 4 \
3 | 6*x |
-8*x *|-5 + -------|
| 4|
\ -1 + x /
--------------------
3/2
/ 4\
\1 - x /
$$- \frac{8 x^{3} \left(\frac{6 x^{4}}{x^{4} - 1} - 5\right)}{\left(1 - x^{4}\right)^{\frac{3}{2}}}$$