/ 4 \ / 4\
|1 + --|*sign|4 + x - -|
| 2| \ x/
\ x /
------------------------
| 4 |
|x - - + 4|
| x |
$$\frac{\left(1 + \frac{4}{x^{2}}\right) \operatorname{sign}{\left(x + 4 - \frac{4}{x} \right)}}{\left|{\left(x - \frac{4}{x}\right) + 4}\right|}$$
2
/ 4 \ 2/ 4\
/ 4\ |1 + --| *sign |4 + x - -|
8*sign|4 + x - -| | 2| \ x/
/ 4 \ d / / 4\\ \ x/ \ x /
|1 + --|*--|sign|4 + x - -|| - ----------------- - --------------------------
| 2| dx\ \ x// 3 | 4|
\ x / x |4 + x - -|
| x|
-----------------------------------------------------------------------------
| 4|
|4 + x - -|
| x|
$$\frac{- \frac{\left(1 + \frac{4}{x^{2}}\right)^{2} \operatorname{sign}^{2}{\left(x + 4 - \frac{4}{x} \right)}}{\left|{x + 4 - \frac{4}{x}}\right|} + \left(1 + \frac{4}{x^{2}}\right) \frac{d}{d x} \operatorname{sign}{\left(x + 4 - \frac{4}{x} \right)} - \frac{8 \operatorname{sign}{\left(x + 4 - \frac{4}{x} \right)}}{x^{3}}}{\left|{x + 4 - \frac{4}{x}}\right|}$$
3 2
/ 4 \ 3/ 4\ / 4 \ d / / 4\\ / 4\ 2/ 4\ / 4 \
d / / 4\\ / 4\ 2*|1 + --| *sign |4 + x - -| 3*|1 + --| *--|sign|4 + x - -||*sign|4 + x - -| 24*sign |4 + x - -|*|1 + --|
2 16*--|sign|4 + x - -|| 24*sign|4 + x - -| | 2| \ x/ | 2| dx\ \ x// \ x/ \ x/ | 2|
/ 4 \ d / / 4\\ dx\ \ x// \ x/ \ x / \ x / \ x /
|1 + --|*---|sign|4 + x - -|| - ---------------------- + ------------------ + ---------------------------- - ----------------------------------------------- + ----------------------------
| 2| 2\ \ x// 3 4 2 | 4| 3 | 4|
\ x / dx x x | 4| |4 + x - -| x *|4 + x - -|
|4 + x - -| | x| | x|
| x|
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 4|
|4 + x - -|
| x|
$$\frac{\frac{2 \left(1 + \frac{4}{x^{2}}\right)^{3} \operatorname{sign}^{3}{\left(x + 4 - \frac{4}{x} \right)}}{\left|{x + 4 - \frac{4}{x}}\right|^{2}} - \frac{3 \left(1 + \frac{4}{x^{2}}\right)^{2} \operatorname{sign}{\left(x + 4 - \frac{4}{x} \right)} \frac{d}{d x} \operatorname{sign}{\left(x + 4 - \frac{4}{x} \right)}}{\left|{x + 4 - \frac{4}{x}}\right|} + \left(1 + \frac{4}{x^{2}}\right) \frac{d^{2}}{d x^{2}} \operatorname{sign}{\left(x + 4 - \frac{4}{x} \right)} + \frac{24 \left(1 + \frac{4}{x^{2}}\right) \operatorname{sign}^{2}{\left(x + 4 - \frac{4}{x} \right)}}{x^{3} \left|{x + 4 - \frac{4}{x}}\right|} - \frac{16 \frac{d}{d x} \operatorname{sign}{\left(x + 4 - \frac{4}{x} \right)}}{x^{3}} + \frac{24 \operatorname{sign}{\left(x + 4 - \frac{4}{x} \right)}}{x^{4}}}{\left|{x + 4 - \frac{4}{x}}\right|}$$