$$2 \cdot y = \frac { \tan x } { x } \cdot e ^ { x } \log x$$
$y=\frac{\log(x)\tan(x)e^{x}}{2x}$
$\nexists n_{1}\in \mathrm{Z}\text{ : }x=\pi n_{1}+\frac{\pi }{2}\text{ and }x>0$
