Hier ein Beispiel
\documentclass[12pt, a4paper,xcolor=dvipsnames]{beamer}
\usetheme{Dresden}
\usecolortheme[named=red]{structure}
\usepackage{xcolor}
\usepackage[ngerman]{babel}
\usepackage[utf8x]{inputenc}
\usepackage{amsmath,amsfonts,amssymb}
\usefonttheme[onlymath]{serif}
\newcommand{\p}{\partial }
\begin{document}
\begin{frame}{}
Test Test Test Test Test
\begin{align*}
\onslide<2->{
\only<1-6>{
\frac{\p r^2}{\p x}=
\onslide<3->{2r\frac{\p r}{\p x}=}
\onslide<4->{ 2x \Leftrightarrow }
\fcolorbox{white}{white}{$\onslide<5-> {\dfrac{\p r}{\p x}=\dfrac{x}{r}}
\onslide<6->{=\cos\varphi.}$}
}
\only<7->{
\frac{\p r^2}{\p x}=
2r\frac{\p r}{\p x}=
2x
\Leftrightarrow {\fcolorbox{red!70!black}{red!30!white}{$\alert<11>{\dfrac{\p r}{\p x}}=\dfrac{x}{r}=\cos\varphi.$}
}
}
}
\end{align*}
\onslide<8->{Hier verschiebt sich etwas.
}
\onslide<9->{
\begin{align*}
\only<8-12>{\frac{\p y}{\p x}=
\onslide<10->{0=
\alert<11>{\frac{\p r}{\p x}}
\sin\varphi + r\frac{\p \varphi}{\p x}\cos\varphi
\onslide<12-> {
\Leftrightarrow \fcolorbox{white}{white}{$\dfrac{\p \varphi}{\p x}=-\dfrac{r}{\sin\varphi}.$}
}}}
\only<13->{\frac{\p y}{\p x}=
0=\frac{\p r}{\p x}
\sin\varphi + r\frac{\p \varphi}{\p x}\cos\varphi
\Leftrightarrow
\fcolorbox{red!70!black}{red!30!white}{$\dfrac{\p \varphi}{\p x}=-\dfrac{r}{\sin\varphi}.$}
}
\end{align*}
}
\onslide<14->{
Das ist ein Test
}
\onslide<15->{
\begin{align*}
\fcolorbox{red!70!black}{red!30!white}{$\dfrac{\p r}{\p y}=\sin\varphi$} \quad \fcolorbox{red!70!black}{red!30!white}{$\dfrac{\p \varphi}{\p y}=\dfrac{\cos\varphi}{r}.$}
\end{align*}
}
\end{frame}
\end{document}Beste Grüße
Freddy
