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%%
%% An UIT Edition example
%%
%% Example 04-26-1 on page 137.
%%
%% Copyright (C) 2012 Vo\ss
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3
%% of this license or (at your option) any later version.
%%
%% See http://www.latex-project.org/lppl.txt for details.
%%
% Show page(s) 1,2,3
%% ====
\PassOptionsToClass{}{beamer}
\documentclass{exabeamer}
\usepackage[utf8]{inputenc}
%\StartShownPreambleCommands
\usepackage{amsmath}
%\StopShownPreambleCommands
\begin{document}
\begin{frame}{Equation lines as overlays}
Text before the equation\ldots
\begin{align}
y &= a \tag{constant}\\
\uncover<2->{y &= a\cdot x\tag{linear}\\}
\uncover<3->{y &= a\cdot x+b\cdot x^2\tag{quadratic}\\}
\notag% empty line necessary for beamer
\end{align}\vspace{-1.5\normalbaselineskip}% remove line feed through notag
Text after the equation\ldots
\end{frame}
\end{document}
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