1 洛必达法则补充
$$\begin{equation}
IF = \left\{
\begin{array}{rl}
f(x)\to \infty \\ \\
g(x)\to \infty \\ \\
\frac{f'(x)}{g'(x)}\to L
\end{array} \right.
\end{equation}
\ \ \ AS \ \ x\to a \ \ THEN \ \frac{f(x)}{g(x)}\
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