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WP-Math-2 can help you insert math formula into WordPress posts or comments. You can use <code>$$...$$</code>(block, only one math expression per line) and <code>$...$</code>(inline, around the text) to insert math. This plugin will render them to HTML or MathML code snippets(Depends on your browser. If your browser supports MathML, it will use MathML, otherwise, use HTML and CSS instead). This work is done by javascript. So your browser must enable JavaScript.
But in most of RSS readers, any JavaScript snippets cannot execute. So I made a trick. WP-Math-2 will convert LaTeX text to images. So users can see math contents with their favorite RSS reader software.

WP-Math-2

WP-Math-2 is a plugin that can convert LaTeX math formula to HTML of images, so that the formula could be shown in browser.

Ron Fredericks

Put your plain text <a href="https://www.biophysicslab.com/wp-content/plugins/wpmathpub/phpmathpublisher/doc/help.html" rel="nofollow ugc">mathematical expressions</a> between [pmath size=xx]…[/pmath] shortcode tags. Useful xx-size integer values range from 8 to 24 (default is 12).
Get more information <a href="https://www.biophysicslab.com/wordpress-math-publisher-plugin/" title="wpmathpub discussion page" rel="nofollow ugc">wpmathpub Plugin</a>
<h3>How To</h3>
To toggle to the math mode within your blog’s content, you must use the [pmath size=xx]…[/pmath] markdown tag. The plugin automatically replaces your math text commands into HTML image tags that look sort of like this: 
<img src=”MathFileName.png” style=”vertical-align:-xxpx; display: inline-block ;” alt=”your math text command” title=”your math text command”/>.
Use the shortcode block to enter math equations from the Gutenberg WordPress block editor.
The math commands must be separated by a space character or surrounded by {}.
Examples:
<ul>
<li>[pmath size=12]S(f)(t)=a_{0}+sum{n=1}{+infty}{a_{n} cos(n omega t)+b_{n} sin(n omega t)}[/pmath] </li>
<li>[pmath size=24]delim{lbrace}{matrix{3}{1}{{3x-5y+z=0} {sqrt{2}x-7y+8z=0} {x-8y+9z=0}}}{ }[/pmath] </li>
<li>[pmath]delim{|}{{1/N} sum{n=1}{N}{gamma(u_n)} – 1/{2 pi} int{0}{2 pi}{gamma(t) dt}}{|} le epsilon/3[/pmath]</li>
<li>[pmath size=16]vec{Del}f(x,y) ~ = ~ {partial{f}}/{partial{x}}hat{i} ~ + ~ {partial{f}}/{partial{y}} hat{j}[/pmath]</li>
<li>[pmath size=16]{Del}f(x,y) ~ = ~ {partial{f}}/{partial{x}}i ~ + ~ {partial{f}}/{partial{y}} j[/pmath]</li>
</ul>
Math elements supported:
<ul>
<li>Usual commands</li>
<li>Parenthesis</li>
<li>Math space</li>
<li>Greek letters</li>
<li>Symbols</li>
<li>Arrows</li>
<li>Sets</li>
<li>Roots</li>
<li>Limits</li>
<li>Big operators</li>
<li>Delimiters</li>
<li>Matrix</li>
<li>Constructions</li>
</ul>
<a href="https://www.biophysicslab.com/wp-content/plugins/wpmathpub/phpmathpublisher/doc/help.html" title="See complete list of elements and the symbols they generate here" rel="nofollow ugc">pmath syntax</a>
<h3>Credits</h3>
<ul>
<li>Thanx to <a href="https://www.xm1math.net/" rel="nofollow ugc">Pascal Brachet</a> for the original PhpMathPublisher library.</li>
</ul>

WP Math Publisher – wpmathpub

This plugin uses shortcode tags to display mathematical equations within your WordPress posts, pages, and comments.

WP-Math-2 vs WP Math Publisher – wpmathpub