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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.

Tom Churchman

The KaTeX WordPress plugin enables you to use the fastest <a href="https://github.com/Khan/KaTeX" rel="nofollow ugc">TeX math typesetting engine</a> on your WordPress website. You can include TeX inside a <code>[katex]...[/katex]</code> shortcode or in a Gutenberg block. Either way the math will render beautifully on your website. When using Gutenberg blocks, the equations will render immediately inside your editor!
Equations in blocks or using the <code>[katex display=true]...[/katex]</code> shortcode will render on page in display mode–with bigger symbols–centered on their own line.
For compatibility with other LaTeX plugins, this plugin optionally supports <code>[latex]...[/latex]</code> shortcodes.
<a href="https://wordpress.org/plugins/katex" rel="ugc">Plugin Website</a>
<h3>Assets</h3>
This plugin includes minified assets provided by the KaTeX project. 
The source code is available in <a href="https://github.com/KaTeX/KaTeX/tree/v0.16.22" rel="nofollow ugc">the KaTeX git repository on GitHub</a>.

KaTeX

Kudos to the author of this plugin for their incredible support!

Excellent support

I am writing a lot of equations these days and I am in love with this plugin.

Excellent plugin

Use the fastest math typesetting library on your website.

WP-Math-2 vs KaTeX