MikTeX cannot compile when breqn package included

Question

I'm seeking for automatic line breaking of math expressions (the example bellow), best recommended option seems breqn package. After MikTeX installed mh packages, MikTeX cannot build an output (I use TeXnic Center editor) (the text content is shortened):

\documentclass[a4paper,fleqn,leqno]{article} 
    \usepackage[utf8]{inputenc}
    \usepackage[czech]{babel}
    \usepackage[IL2]{fontenc}
    \usepackage{color}
    \usepackage[top=1.5in, bottom=1.5in, left=1in, right=1in]{geometry}
    \usepackage{hyperref}
    \usepackage{tikz}
    \usepackage{amsmath,breqn}
    \usepackage[fontsize=12]{scrextend}
    \DeclareMathSizes{12}{16}{16}{16}
    \pagestyle{headings}
    \linespread{1}
    \hypersetup{colorlinks=true,linkcolor=black,pdfnewwindow=true,urlcolor=blue}
    \begin{document}

    \section{Nadpis}\label{sec:nadpisa}
    Text pod nadpisem.
    \subsection{Podnadpis}\label{sec:podnadpisa}
    Text pod podnadpisem.
    \subsubsection{Podpodnadpis}\label{sec:podpodnadpisa}
    Text pod podpodnadpisem.

    \begin{multline}
    t_{2}x_{1}cos\alpha+t_{2}y_{1}sin\alpha+t_{2}z_{1}sin\gamma cos\alpha-t_{2}z_{1}sin\alpha sin\beta-t_{3}x_{1}cos\alpha-t_{3}y_{1}sin\alpha-t_{3}z_{1}sin\gamma cos\alpha+t_{3}z_{1}sin\alpha sin\beta-t_{1}x_{2}cos\alpha-t_{1}y_{2}sin\alpha-t_{1}z_{2}sin\gamma cos\alpha+t_{1}z_{2}sin\alpha sin\beta+ t_{1}x_{3}cos\alpha+t_{1}y_{3}sin\alpha+t_{1}z_{3}sin\gamma cos\alpha-t_{1}z_{3}sin\alpha sin\beta+ t_{3}x_{2}cos\alpha+t_{3}y_{2}sin\alpha+t_{3}z_{2}sin\gamma cos\alpha-t_{3}z_{2}sin\alpha sin\beta- t_{2}x_{3}cos\alpha-t_{2}y_{3}sin\alpha-t_{2}z_{3}sin\gamma cos\alpha+t_{2}z_{3}sin\alpha sin\beta
    \end{multline}
    \end{document}

It freezes displaying: without pdf output. After excluding breqn package the error disappear.

After excluding \usepackage[IL2]{fontenc} it freezes three lines before:

showing the same error. Is there any solution without rewriting the whole content?

Answer 1

I use MiKTeX and breqn does work with babel, buts doesn't cooperate with most math package. You have to use the right environment, which is dmath. However I think aligned, used with \MoveEqLeft on first line, gives a better result. I give an example of both.

You'll have less problems if you use XeLaTeX and polyglossia. No more loading inputenc nor fontenc. The syntax for loading polyglossia with the Czech language is commented in my preamble; if you want to test, all you have to do is uncommenting these two lines and commenting the babel loading line.

\documentclass[a4paper,fleqn,leqno]{article}
\usepackage[utf8]{inputenc}
%\usepackage{polyglossia}
%\setmainlanguage{czech}
\usepackage[czech]{babel}
\usepackage[IL2]{fontenc}

\usepackage{color}
\usepackage[top=1.5in, bottom=1.5in, left=1in, right=1in]{geometry}
\usepackage{hyperref}
\usepackage{tikz}
\usepackage{mathtools,breqn}
\usepackage[fontsize=12]{scrextend}
\DeclareMathSizes{12}{16}{16}{16}
\pagestyle{headings}
\linespread{1}
\hypersetup{colorlinks=true,linkcolor=black,pdfnewwindow=true,urlcolor=blue}
\begin{document}

\section{Nadpis}\label{sec:nadpisa}
Text pod nadpisem.
\subsection{Podnadpis}\label{sec:podnadpisa}
Text pod podnadpisem.
\subsubsection{Podpodnadpis}\label{sec:podpodnadpisa}
Text pod podpodnadpisem.

\begin{equation}
\begin{aligned}
\MoveEqLeft[3] t_{2}x_{1}\cosα + t_{2}y_{1}\sinα + t_{2}z_{1}\sinγ \cosα \\
 & - t_{2}z_{1}\sinα \sinβ - t_{3}x_{1}\cosα - t_{3}y_{1}\sinα \\
 & - t_{3}z_{1}\sinγ \cosα + t_{3}z_{1}\sinα \sinβ - t_{1}x_{2}\cosα \\
& - t_{1}y_{2}\sinα - t_{1}z_{2}\sinγ \cosα + t_{1}z_{2}\sinα \sinβ \\
 & + t_{1}x_{3}\cosα + t_{1}y_{3}\sinα + t_{1}z_{3}\sinγ \cosα \\
& - t_{1}z_{3}\sinα \sinβ + t_{3}x_{2}\cosα + t_{3}y_{2}\sinα \\
 & + t_{3}z_{2}\sinγ \cosα - t_{3}z_{2}\sinα \sinβ - t_{2}x_{3}\cosα \\
 & - t_{2}y_{3}\sinα - t_{2}z_{3}\sinγ \cosα + t_{2}z_{3}\sinα \sin\beta
\end{aligned}
\end{equation}

\begin{dmath}
t_{2}x_{1}\cos\alpha+t_{2}y_{1}\sin\alpha+t_{2}z_{1}\sinγ \cos\alpha-t_{2}z_{1}\sinα \sin\beta-t_{3}x_{1}\cos\alpha-t_{3}y_{1}\sin\alpha-t_{3}z_{1}\sinγ \cos\alpha+t_{3}z_{1}\sinα \sin\beta-t_{1}x_{2}\cos\alpha-t_{1}y_{2}\sin\alpha-t_{1}z_{2}\sinγ \cos\alpha+t_{1}z_{2}\sinα \sin\beta+ t_{1}x_{3}\cos\alpha+t_{1}y_{3}\sin\alpha+t_{1}z_{3}\sinγ \cos\alpha-t_{1}z_{3}\sinα \sin\beta+ t_{3}x_{2}\cos\alpha+t_{3}y_{2}\sin\alpha+t_{3}z_{2}\sinγ \cos\alpha-t_{3}z_{2}\sinα \sin\beta- t_{2}x_{3}\cos\alpha-t_{2}y_{3}\sin\alpha-t_{2}z_{3}\sinγ \cos\alpha+t_{2}z_{3}\sinα \sin\beta
\end{dmath}

\end{document}