A quick google search found this brief tutorial on voice-to-math in EquatIO:
https://alicekeeler.com/2017/04/25/equatio-voice-type-math/

There are a number of youtube videos posted by texthelp, the makers of EquatIO and Read+Write, including this lengthy webinar, which I haven't viewed:


This video is by someone else, but is about using LaTex in EquatIO for algebra II:




...pronounced like the long vowel and first letter of the alphabet...