Fira Math is a sans-serif font with Unicode math support. This font is a fork of
Fira Math can be used in LaTeX or Microsoft Word after installed on your OS.
% Compiled with xelatex or lualatex
\documentclass{article}
\usepackage{amsmath}
\usepackage[mathrm=sym]{unicode-math}
\setmathfont{Fira Math}
\begin{document}
\[
\int_0^{\mathrm{\pi}} \sin x \, \mathrm{d}x = 2
\]
\end{document}
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Create a new equation. Then select the little additional settings corner.
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In the menu, change the Default font to Fira Math.
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In order for the changes to take effect, you will have to create a new equation environment (the current one will not be changed).
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To change the font in existing equations, select the equation text and select an OpenType math-enabled font (such as Fira Math).
See https://superuser.com/q/1114697.
This Font Software is licensed under the SIL Open Font License, Version 1.1.
Copyright (C) 2018 by Xiangdong Zeng.