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