-x 3 2
3 - 4*e - -------- + 3*tan (x)
2
1 + 9*x
$$3 \tan^{2}{\left(x \right)} + 3 - 4 e^{- x} - \frac{3}{9 x^{2} + 1}$$
/ -x / 2 \ 27*x \
2*|2*e + 3*\1 + tan (x)/*tan(x) + -----------|
| 2|
| / 2\ |
\ \1 + 9*x / /
$$2 \left(\frac{27 x}{\left(9 x^{2} + 1\right)^{2}} + 3 \left(\tan^{2}{\left(x \right)} + 1\right) \tan{\left(x \right)} + 2 e^{- x}\right)$$
/ 2 2 \
| -x / 2 \ 27 972*x 2 / 2 \|
2*|- 2*e + 3*\1 + tan (x)/ + ----------- - ----------- + 6*tan (x)*\1 + tan (x)/|
| 2 3 |
| / 2\ / 2\ |
\ \1 + 9*x / \1 + 9*x / /
$$2 \left(- \frac{972 x^{2}}{\left(9 x^{2} + 1\right)^{3}} + 3 \left(\tan^{2}{\left(x \right)} + 1\right)^{2} + 6 \left(\tan^{2}{\left(x \right)} + 1\right) \tan^{2}{\left(x \right)} - 2 e^{- x} + \frac{27}{\left(9 x^{2} + 1\right)^{2}}\right)$$