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Completa la tabla de valores para cada función. Luego utiliza el resultado para estimar el límite de [tex]$f(x)$[/tex] cuando [tex]$x$[/tex] crece indefinidamente y sin cota.

a) [tex]$f(x)=\frac{x}{1+x^2}$[/tex]
\begin{tabular}{|c|c|c|c|c|c|c|c|}
\hline [tex]$x$[/tex] & -100 & -10 & -1 & 0 & 1 & 10 & 100 \\
\hline [tex]$f(x)$[/tex] & & & & & & & \\
\hline
\end{tabular}

b) [tex]$f(x)=\frac{x-2}{2+x^2}$[/tex]
\begin{tabular}{|c|c|c|c|c|c|c|c|}
\hline [tex]$x$[/tex] & -100 & -10 & -1 & 0 & 1 & 10 & 100 \\
\hline [tex]$f(x)$[/tex] & & & & & & & \\
\hline
\end{tabular}

c) [tex]$f(x)=\frac{x}{12+3x^2}$[/tex]
\begin{tabular}{|c|c|c|c|c|c|c|c|}
\hline [tex]$x$[/tex] & -100 & -10 & -1 & 0 & 1 & 10 & 100 \\
\hline [tex]$f(x)$[/tex] & & & & & & & \\
\hline
\end{tabular}

d) [tex]$f(x)=\frac{3x}{x+x^3}$[/tex]
\begin{tabular}{|c|c|c|c|c|c|c|c|}
\hline [tex]$x$[/tex] & -100 & -10 & -1 & 0 & 1 & 10 & 100 \\
\hline [tex]$f(x)$[/tex] & & & & & & & \\
\hline
\end{tabular}