In my beamer, I applied "\setmainfont{Arial}" and "\setsansfont{Arial}" to set the main font as Arial, and I would like to apply the same or a similar font in the math mode. I write my LaTeK code as below, thanks to Tilde in math mode using helvetica.
However, there are many errors when running the code even if the pdf file can be still generated.
and the "\partical" cannot be displayed.
Shall I use another kind of font? I just want to use a math font that looks like Arial and also has an effect on the Greek alphabet like "\alpha" or "\varepsilon".
\documentclass[10 pt]{beamer}
\usepackage{amsmath, amssymb}
\setmainfont{Arial}
\setsansfont{Arial}
\numberwithin{equation}{section}
\usepackage{mathtools}
\usepackage{iftex}
\usepackage[ngerman]{babel}
\ifPDFTeX
\usepackage[T1]{fontenc}
\usepackage[scaled=0.92]{helvet}
\usepackage[helvet]{sfmath}
\renewcommand{\familydefault}{\sfdefault}
\else
\usepackage{unicode-math}
\setmainfont{Arial}
\defaultfontfeatures{Scale=MatchUppercase}
\setsansfont{Arial}
%% Change this line to change the math symbols:
\setmathfont{Asana Math}
%% Set various (but not all) Unicode tilde symbols:
\setmathfont[range={"007E,"02DC,"02F7,"0303,"0330,"0334,"033F,"034A,"0360}]{TeX Gyre DejaVu Math}
%% Set the math alphabets:
\setmathfont[range=up]{Arial}
\setmathfont[range=it]{Arial Italic}
\setmathfont[range=bfup]{Arial Bold}
\setmathfont[range=bfit]{Arial Bold Italic}
\newcommand*{\dif}{\mathrm{d}}
\newcommand*{\N}{\mathrm{N}}
\begin{decument}
\begin{frame}
The equations were presented as
\begin{align}
&y_{i} = \beta_{1}x_{i, 1} + \beta_{2}\sin(x_{i, 2}) + \beta_{3}\ln(x_{i, 3}) + \varepsilon_{i} \quad \Phi(x) = 1-\Phi(-x) \\
&\dfrac{\dif y}{\dif x} = e^{x} \quad \dfrac{\partial u}{\partial t}\bigg|_{t=0} = t \quad \oint_{|C|=1} f(z) \dif z = 2\pi i \times \left\lbrace \mathrm{res}[f(z), i] \right\rbrace \\
&x_{n} \iid \N(0, 1) \quad x^{2}_{n} \iid \chi^{2}(1) \quad \sum_{n=1}^{N} x_{n} \iid \chi^{2}(N) \\
&\iint_{R} g(x,y)\dif x\dif y= \int_{0}^{1}\dif x \int_{0}^{1}g(x,y)\dif y \quad \lim\limits_{\rho \to 0}h(\rho) = 0\left( \dfrac{1}{\alpha} \right) \\
& x =\begin{cases}
1, \mathcal{H}_{0}\\
0, \mathcal{H}_{1}
\end{cases}\; (2\pi L(x;\mu,\sigma^{2}) = \sigma^{2})^{-\frac{N}{2}}\exp\left\lbrace -\dfrac{\sum_{n=1}^{N}(x_{n} - \mu)^{2}}{2\sigma^{2}} \right\rbrace
\end{align}
\end{frame}
\end{document}


\begin{decument}and there are double\setsansfont{Arial}and many mix of the packages. And do you want usehelvetwitharialtogheter? – Sebastiano Apr 06 '20 at 10:42