LaTeX doesn't work [closed]

LaTeX is not working just now. I posted this question, and the LaTeX code is plainly rendered as ASCII.

R: There is a more elegant/efficient way of writing this?

(possibly a duplicate of this one

LaTeX support in Mobile Application

but I also see it on PC, and I didn't check on a phone)

Edit: I edited the linked post to remove Latex code, and used unicode instead.