$09$:$51$

$874$

$2.\underset{x0}{lim}\frac{1}{2x}{\displaystyle \underset{2x}{\overset{0}{}}}(1tan3t{)}^{\frac{1}{t}}dt=?$

$($a$)-e^4,{\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}(1tan(\frac{3}{4}){)}^4*\frac{-1}{4^2}.$

$($b$)-e^3$

$($c$)0$

$($d$)e^3$

$($e$)e^4$