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+%%
+%% The LaTeX Companion, 3ed
+%%
+%% Example 12-3-27 on page II-249 in "newpxmath --- Using the PX fonts for math".
+%%
+%% Copyright (C) 2022 Frank Mittelbach
+%%
+%% It may be distributed and/or modified under the conditions
+%% of the LaTeX Project Public License, either version 1.3c
+%% of this license or (at your option) any later version.
+%%
+%% See https://www.latex-project.org/lppl.txt for details.
+%%
+
+\documentclass{tlc3exa}
+\pagestyle{empty}
+\setcounter{page}{6}
+\setlength\textwidth{207.0pt}
+%StartShownPreambleCommands
+\usepackage{amsmath,newpxtext,newpxmath}
+%StopShownPreambleCommands
+
+\begin{document}
+A better result:
+\[ t[u_1, \dots, u_n] = \sum_{k=1}^n
+ \binom{n-1}{k-1} (1-t)^{n-k}t^{k-1}u_k \]
+\end{document}