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\documentclass{beamer}\usepackage{mathtools,amssymb}\usepackage{fontspec}\newcommand*{\myfont}{Georgia}\setmainfont{\myfont}[Ligatures=TeX]\setsansfont{\myfont}[Scale=0.975]\setmonofont{\myfont}\usepackage{unicode-math}\setmathfont{Latin Modern Math}\setmathfont[range={"0030-"0039}]{\myfont}\setmathfont[range={\varnothing}]{Asana Math}\AtBeginDocument{\renewcommand*{\setminus}{\smallsetminus}}\usepackage[english,russian]{babel}\begin{document}\noindent$0123456789AaBbCcfi$\\$\textnormal{0123456789}\textit{AaBbCcfi}$\begin{gather}\int_{0}^{1}x^{-x}\mathrm{d}x=\sum_{n=1}^{\infty}n^{-n}\\A\setminus A=\varnothing=\emptyset\end{gather}\begin{equation}G(\theta)= \begin{cases}& 29 - 25\lg(\theta)\text{ при } 1^{\circ}<\theta\leq20^{\circ}; \\& -3,5\text{ при } 20^{\circ}<\theta\leq26,3^{\circ}; \\& 32 - 25\lg(\theta)\text{ при } 26,3^{\circ}<\theta\leq48^{\circ}; \\& -10\text{ при } 48^{\circ}<\theta\leq180^{\circ}. \\\end{cases}\end{equation}\end{document}