Typewriter Animation with Math

Question

A previous question inquires about animating some simple text, with an elegant solution that uses the animate package and the xstring package.

Is there a way to alter this code so that it works in math mode? For example, how can the following be animated to appear letter by letter?

Pythagorean theorem $a^2 + b^2 = c^2$

Also, is it possible to animate the following to appear character by character?

\begin{equation} \text{Quadratic formula } x = \frac{-b \pm \sqrt{b^2 - 4 a c } }{ 2 a} \end{equation}

Animating either of these statements would be quite helpful.

Late edit:

Bonus for doing multiple lines in a single animation,

Pythagorean theorem $a^2 + b^2 = c^2$\par
This means $c = \sqrt{a^2 + c^2}$
\[Cos \theta = \frac{c}{a}\]

Answer 1

\documentclass{beamer}
\setbeamertemplate{navigation symbols}{}

\begin{document}

\Huge
\let~\pause
\frame{
    P~y~t~h~a~g~o~r~e~a~n~\ $a^{~2}~+~b^{~2}~=~c^{~2}$
}

\end{document}

Another approach

\documentclass{beamer}
\setbeamertemplate{navigation symbols}{}

\begin{document}

\makeatletter
\def\BB{\pgfsys@begininvisible}
\def\EE{\pgfsys@endinvisible}
\makeatother

\begin{frame}
    \begin{equation}
        \text{Qua\only<1>{\BB}dra\only<2>{\BB}tic\only<3>{\BB} formula }
            x = \frac{-b \pm \sqrt{b^2 - 4 a c } }{ 2 a}
        \EE
    \end{equation}
\end{frame}

\begin{frame}
    \begin{equation}
        \text{Quadratic for\only<1>{\BB}mu\only<2>{\BB}la\only<3>{\BB} }
            x = \frac{-b \pm \sqrt{b^2 - 4 a c } }{ 2 a}
        \EE
    \end{equation}
\end{frame}

\begin{frame}
    \begin{equation}
        \text{Quadratic formula }
            x = \only<+>\BB\frac{-b\only<+>\BB\pm\only<+>\BB\sqrt{b^2 - 4 a c } }{ 2 a}
        \EE
    \end{equation}
\end{frame}

\begin{frame}
    \begin{equation}
        \text{Quadratic formula }
            x = \frac{-b \pm \sqrt{\only<+>\BB b^2\only<+>\BB- 4 a c\only<+>\BB} }{ 2 a}
        \EE
    \end{equation}
\end{frame}

\begin{frame}
    \begin{equation}
        \text{Quadratic formula }
            x = \frac{-b \pm \sqrt{b^2 - 4 a c } }{\only<+>\BB 2 a\only<+>\BB}
        \EE
    \end{equation}
\end{frame}


\begin{frame}
    \begin{equation}
    \BB
        \text{Quadratic \only<+>\EE formula \only<+>\EE}
            x = \only<+>\EE\frac{-b \pm \only<+>\EE\sqrt{b^2 - 4 a c } \only<+>\EE}{ 2 a}
    \end{equation}
    \only<+>\EE
\end{frame}

\end{document}