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c = \pm\sqrt{a^2 + b^2}

% \f is defined as #1f(#2) using the macro \f\relax{x} = \int_{-\infty}^\infty \f\hat\xi\,e^{2 \pi i \xi x} \,d\xi

This is some text $math \frac12$ other text $\unsupported$ Other node \[ \text{displaymath} \frac{1}{2} \] blah $$ \int_2^3 $$ and some more text \(and math\) blah. And $math with a \$ sign$.

  Stuff in a $pre tag$
  

An AMS environment without $$…$$ delimiters.

\begin{equation} \begin{split} a &=b+c\ &=e+f \end{split} \end{equation}