This incantation worked for me:

#+name: foo
#+begin_src emacs-lisp :exports both :results drawer
  "Pseudo-function returning a LaTeX pseudo-result."
  "\\[\\displaystyle{\\sin\\left(\\frac{a}{b}\\right)}\\]"
#+end_src

#+RESULTS: foo
:results:
\[\displaystyle{\sin\left(\frac{a}{b}\right)}\]
:end:

the key is the drawer I think.
John

-----------------------------------
Professor John Kitchin (he/him/his)
Doherty Hall A207F
Department of Chemical Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
412-268-7803
@johnkitchin
http://kitchingroup.cheme.cmu.edu



On Sun, Jul 4, 2021 at 2:51 PM Emmanuel Charpentier <emm.charpentier@free.fr>
wrote:

> I tried this :
>
> #+property: header-args:sage :session
>
> #+options: tex:t toc:nil author:nil
>
> #+begin_src emacs-lisp :exports none
>
>   ;; (customize-set-variable
>
>   ;;  'org-latex-to-mathml-convert-command
>
>   ;;  "latexmlmath \"%i\" --presentationmathml=%o")
>
>   (custom-set-variables
>
>    '(org-latex-to-mathml-convert-command
>
>       "java -jar %j -unicode -force -df %o %I")
>
>    '(org-latex-to-mathml-jar-file
>
>       "/usr/local/bin/mathtoweb.jar"))
>
> #+end_src
>
>
> A "normal" function call with org result...
>
>
> #+name: foo
>
> #+begin_src emacs-lisp :exports both :results org
>
>   "Pseudo-function returning a LaTeX pseudo-result."
>
>   "\\[\\displaystyle{\\sin\\left(\\frac{a}{b}\\right)}\\]"
>
> #+end_src
>
>
> #+RESULTS: foo
>
> #+begin_src org
>
> \[\displaystyle{\sin\left(\frac{a}{b}\right)}\]
>
> #+end_src
>
>
> Which exports the LaTeX *source* (uncompiled) in PDF, HTML and ODT.
>
> I'm currently lookin into a =:post= workaround. But an option to export
> =latex= blocks to selected exporters (ODT, HTML, possibly Morkdown via
> pandoc).
>
> I'll keep you posted.
>
> Le dimanche 04 juillet 2021 à 14:10 -0400, John Kitchin a écrit :
> Can you declare the output as org so they will just be latex snippets?
>
> On Sun, Jul 4, 2021 at 3:46 AM Emmanuel Charpentier <
> emm.charpentier@free.fr> wrote:
>
> Dear list,
>
> Org-mode offers the ability to create functions returning LaTeX results :
> such occurrences are frequent with Sagemath, Maxima, Mathematica, R, and
> even emacs's Calc...
>
> Such functions can be declared has having LaTeX output, and the resulting
>  =#+begin_export latex ...  #+end_export latex= block is exported as LaTeX
> and end up in the PDF versin.
>
> But such blocks seem to export **only** to LaTeX/PDF ; more specically,
> they do not export to HTML nor ODT. In order to insert those results at
> export, one **has** to print them **raw**. See the attached examples, and
> compare PDF, HTML and ODT outputs of the enclosed zip archive (necessary to
> avoid the wrath of the spam filter of my provider ;-)...)..
>
> Unless I am mistaken, this is the *only* way to export LaTeX exports to
> HTML/ODT ; I am not aware of any option allowing to force such exports. So
> a couple questions :
>
>    - Am I mistaken ?
>    - Are there more steamlined ways to get LaTeX in
>    HTML/ODF/whatever-but-not-LaTeX ?
>    - Wouldn't an option to allow these exports be a welcome addition to
>    the export structure (or possibly to the various exporters) ?
>
>
> Thanks in advance,
>
>
>