I would like to obtain the following:

* the title of a section occurs in the text as `Math symbols $\boldsymbol{\sum, \int}$`,
* in the table of contents it is `Math symbols $\sum, \int$` (without bold),
* in bookmarks it is `Math symbols sum, integral`.

I can obtain what I want in bookmarks and either of two (bold or standard) in both: TOC and text with `\texorpdfstring`. I can also use `\section[This will go to bookmarks and TOC.]{This will appear in the content.}`. But I don't know how to make it all work at the same time.