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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.

Amaury RAMBAUD

Insert a simple calculator in your WordPress website with a widget or the shortcode [elemental_calculator]. 
The Elemental Calculator plugin is responsive and support numeric keyboard.

Elemental Calculator

This is the only simple and fast calculator plugin to set up in wordpress. In addition we can also use the keyboard to use it.

fast and reliable

Insert a simple calculator in your WordPress website with a widget or the shortcode [elemental_calculator].

WP-Math-2 vs Elemental Calculator