I would be really surprised to hear of a single undergrad math major hitting 300-level math without learning at least the basics of LaTeX syntax. For better or worse, TeX is to math what SQL is to databases. It might be old and have some serious challenges surrounding it, but it’s managed to remain better than anything that’s tried to dethrone it. I can remember how mysterious all the backslashes looked when I first started working with TeX in 1986, but they quickly disappear into the background.