%%
%% The LaTeX Companion, 3ed
%%
%% Example 3-4-3 on page I-178 in "Change case of text intelligently (formerly textcase)".
%%
%% 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{159.0pt}

%StartShownPreambleCommands

%StopShownPreambleCommands

\begin{document}
\MakeUppercase{Neither of these \textbf{fail: $a+B=c$
               and} \emph{for\NoCaseChange{tuna}tely}},
but did so in the past!
\end{document}