\documentclass[11pt]{article}
\usepackage[utf-8]{inputenc}
\usepackage[T2A,T1]{fontenc}
\usepackage[russian]{babel}
\usepackage{amsmath,amssymb,amsfonts,textcomp}
%\usepackage{showkeys}
%\DeclareMathOperator{\tg}{tg}
%\DeclareMathOperator{\ctg}{ctg}
\begin{document}
\fontencoding{T2A}\selectfont
\begin{titlepage}
\huge{\textbf{Собственные функции и собственные числа оператора Лапласа для треугольников}}
\newline
\par
\LARGE{Автор: Бродников Александр Петрович}
\par
\LARGE{Email: chillugy@omsknet.ru}
\par
\LARGE{Homepage: http://chillugy.narod.ru}
\end{titlepage}
%\newpage
%\maketitle{}
%\title{Title Титул}
\include{intro}
\include{deftask}
\include{baricentriccoords}
%\include{file002}
\include{baricentricHelmholz}
\include{solutionview}
\include{boundaryrole}
%\include{file1}
\include{partresultview}
\include{makestrategy}
\include{makemap}
\include{example1}
\include{example2}
\include{need}
\end{document}