\input amstex
\input cyracc.def
\font\tencyr=wncyr10
\def\cyr#1{{\tencyr\cyracc#1}}

\cyr{Izrachunati vrednost funkcije}
$$I(\alpha, p)=\int_0^\infty\frac{1-e^{-\alpha x^p}}{x^p}\,{\rm d}x,$$
\cyr{gde su }$\alpha$\cyr{ i }$p$\cyr{ realni parametri.}

\bye