It's hrd, but it's not that hard. Character recognition is half the problem, the other half is context recognition - and there's abundant reference material available. I think we'll see 'copilot for math' aimed at AP/college level users within a few years.
It's not something that any human can do, bu something that any human can do with help. The first killer app will be 'I found this formula, please tell me how to read it.' Not in the sense of being a math tutor (although that may come, but simply in the sense of helping students to read it out loud, identify symbols like hats or bars and son so on. Most math books are terrible in this respect because they assume the student already knows all the notation or has someone who can lecture or tutor them about it. This massively inhibits solo learners who can't engage in the practice of 'teaching themselves' by verbally walking through formulae or discussing them fluently, unless they're lucky enough to have found a good reference for notation.
If you are not in the latter group, Wikipedia has OK summary articles on notation; and these two books offer variously concise and in-depth tools to built mathematical literacy:
https://www.amazon.com/Mathematical-Notation-Guide-Engineers...
https://www.amazon.com/Programmers-Introduction-Mathematics-...
https://www.amazon.com/Mathematical-Notation-Guide-Engineers...
[1] https://www.amazon.com/Mathematical-Notation-Guide-Engineers...
"Mathematical Notation: A Guide for Engineers and Scientists"
https://www.amazon.com/Mathematical-Notation-Guide-Engineers...
https://www.amazon.com/gp/product/1466230525 - Mathematical Notation: A Guide for Engineers and Scientists
[0]: https://www.amazon.com/gp/aw/d/1466230525/