2
3 + 3*tan (x)
-----------------
/ 2 \
3*\1 + 9*tan (x)/
$$\frac{3 \tan^{2}{\left(x \right)} + 3}{3 \cdot \left(9 \tan^{2}{\left(x \right)} + 1\right)}$$
/ / 2 \\
/ 2 \ | 9*\1 + tan (x)/|
-2*\1 + tan (x)/*|-1 + ---------------|*tan(x)
| 2 |
\ 1 + 9*tan (x) /
----------------------------------------------
2
1 + 9*tan (x)
$$- \frac{2 \cdot \left(\frac{9 \left(\tan^{2}{\left(x \right)} + 1\right)}{9 \tan^{2}{\left(x \right)} + 1} - 1\right) \left(\tan^{2}{\left(x \right)} + 1\right) \tan{\left(x \right)}}{9 \tan^{2}{\left(x \right)} + 1}$$
/ 2 2 \
| / 2 \ 2 / 2 \ / 2 \ 2 |
/ 2 \ | 2 9*\1 + tan (x)/ 54*tan (x)*\1 + tan (x)/ 324*\1 + tan (x)/ *tan (x)|
2*\1 + tan (x)/*|1 + 3*tan (x) - ---------------- - ------------------------ + --------------------------|
| 2 2 2 |
| 1 + 9*tan (x) 1 + 9*tan (x) / 2 \ |
\ \1 + 9*tan (x)/ /
----------------------------------------------------------------------------------------------------------
2
1 + 9*tan (x)
$$\frac{2 \left(\tan^{2}{\left(x \right)} + 1\right) \left(\frac{324 \left(\tan^{2}{\left(x \right)} + 1\right)^{2} \tan^{2}{\left(x \right)}}{\left(9 \tan^{2}{\left(x \right)} + 1\right)^{2}} - \frac{54 \left(\tan^{2}{\left(x \right)} + 1\right) \tan^{2}{\left(x \right)}}{9 \tan^{2}{\left(x \right)} + 1} + 3 \tan^{2}{\left(x \right)} - \frac{9 \left(\tan^{2}{\left(x \right)} + 1\right)^{2}}{9 \tan^{2}{\left(x \right)} + 1} + 1\right)}{9 \tan^{2}{\left(x \right)} + 1}$$