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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.

Shohidul Islam Apu

CF7 Math Captcha is a lightweight plugin that adds a math captcha field to your Contact Form 7 forms. 
It helps reduce spam without using Google reCAPTCHA. 
Very simple to use: just add <code>[mathcaptcha* captcha-field]</code> to your Contact Form 7 form.

Math Captcha for Contact Form 7


Nice, clean and lightweight solution for adding Math Captcha to Contact Form 7. Works smoothly and keeps spam away without extra hassle. Good job, bro! 👏


Keeps spam away without extra hassle

Adds a simple math captcha field for Contact Form 7 to prevent spam submissions.

WP-Math-2 vs Math Captcha for Contact Form 7