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