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\input{regression-test}
\documentclass{article}
\usepackage{unicode-math}
\tagpdfsetup{math/mathml/structelem}
\begin{document}

hello

\[
  \begin{pmatrix}
    1 & 0 & 0 \\
    0 & 1 & 0 \\
    0 & 0 & 1
  \end{pmatrix}
  =
  \begin{cases}
    1 & \text{if $a=b$} \\
    2 & \text{else}
  \end{cases}
\]

\[
  x = \frac{-b \pm \sqrt{b^2-4ac}}{2a}.
\]

\[
  \sum_a\underline c\dot bc'
\]

\begin{align}
  abc&=def & e^{\mathrm{i}\pi}&=-1\\
  \Big(1+2&=3\Big)\\
  5
\end{align}


Es gilt $\sin(x)-\sin(x+2\pi)=0$.

\end{document}