2. Hitung nilai integral berikut dengan batas-batas yang diberikan: \[ \int_{1}^{3}\left(2 x^{3}-4 x^{2}+x\right) d x \]

\( \begin{array} { l } { \lim _ { x \rightarrow 3 } ( \frac { x - 3 } { x ^ { 2 } - 9 } ) } \\ { x } \\ { x ( x ) } \\ { f ( x ) } \\ { - 2.99 } \end{array} - 2.999 | 3 | 3.001 | 3.01 | ) \)

\( \left. \begin{array} { l } { \lim _ { x \rightarrow 0 } ( \frac { \sin x } { x } ) } \\ { \left. \begin{array} { l | l | l | l | } { x } & { - 0.001 } & { 0 } & { 0.001 } \\ \hline f ( x ) & { } & { } & { } \\ \hline \end{array} \right. } \end{array} \right. \)

\( \left. \begin{array} { l | l | l | l | } { \lim _ { x \rightarrow 3 } ( \frac { x - 3 } { x ^ { 2 } - 9 } ) } \\ { x } & { - 2.99 } & { - 2.999 } & { 3 | 3.001 } \\ \hline f ( x ) & { } & { } & { } \\ \hline \end{array} \right. \)

(1)- \( \int_{-\infty}^{\infty} \frac{e^{x}}{1+e^{2 x}} \mathrm{dx} ? \)

6. \( \lim _{x \rightarrow 2}\left(\frac{x^{2}-5 x+6}{x-2}\right) \) \begin{tabular}{l|l|l|l|l|}\( x \) & 1.99 & 1.999 & 2 & 2.001 \\ \hline\( f(x) \) & & & & \\ \hline\end{tabular}