I am wondering if there is a way in which I could put an answer box in TeX mode. To be specific, I am writing problems for an algebra course, and I would like the students to be able to enter answers underneath a radical symbol (square root, cube root, etc.).

I found a feature called tex_ans_rule, though I have not been able to implement this (a document describing tex_ans_rule states that "C<tex_ans_rule> works inside math equations in C<HTML_tth> mode. It does not work in C<Latex2HTML> since this mode produces gif pictures").

Is there any way to have answer boxes underneath radical signs, or in TeX mode in general?

Thank you.