The third derivative
[src]
/ 2 \
| 2*x / x\ x / x\ 2*x|
| 2*e 6*\-3 + e /*e 8*\-3 + e / *e | x
|1 - -------------- - -------------- + -----------------|*e
| 2 2 2|
| / x\ / x\ / 2\ |
| 1 + \-3 + e / 1 + \-3 + e / | / x\ | |
\ \1 + \-3 + e / / /
------------------------------------------------------------
/ 2\
| / x\ |
2*\1 + \-3 + e / /
$$\frac{\left(1 - \frac{6 \left(e^{x} - 3\right) e^{x}}{\left(e^{x} - 3\right)^{2} + 1} - \frac{2 e^{2 x}}{\left(e^{x} - 3\right)^{2} + 1} + \frac{8 \left(e^{x} - 3\right)^{2} e^{2 x}}{\left(\left(e^{x} - 3\right)^{2} + 1\right)^{2}}\right) e^{x}}{2 \left(\left(e^{x} - 3\right)^{2} + 1\right)}$$