[help-texinfo] LaTeX in @tex?

[Jesse Williamson]

Hi everyone,

I'm trying to get this to work:

@tex
\frac{a}{b}
@end tex

...and when I run:
texi2pdf foo.texi

I get "Undefined control sequence." for \frac. A similar error occurs
using @math{}.

My log file says that I'm using:
This is pdfTeX, Version 3.14159265-2.6-1.40.18

I guess what I want is for LaTeX to be available inside the @tex tags? How
do I get it to happen? I haven't hit on the right incantation from the
documentation
yet.

Appreciatively,

-Jesse