\input amstex
\input cyracc.def
\font\tencyr=wncyr10
\def\cyr#1{{\tencyr\cyracc#1}}
\def\liml{\lim\limits}
\def\tezi{\rightarrow}
\def\lopeq{\vbox{\hbox{$[$\hbox{\cyr{Lop.}}$]$}\hbox{=}}}

$$\liml_{x\tezi+0}\frac{\ln(1-\alpha^2x^2)}{x\,\sqrt{1-x^2}}
\lopeq\liml_{x\tezi+0}\frac{-\frac{2\alpha^2}{1-\alpha^2x^2}}
{\sqrt{1-x^2}+\frac{(-1)\,x}{\sqrt{1-x^2}}}=\liml_{x\tezi+0}
-\frac{2\alpha^2}{(1-\alpha^2x^2)\Bigl(\sqrt{1-x^2}-\frac{x}
{\sqrt{1-x^2}}\Bigr)}=-2\alpha^2$$

\bye