I'd like to just have a few inline formulas evaluated in my org-mode document (I'm exporting to LaTeX if that matters). Something like this:
=========================
# a constant:
# pi = 3.14159
The value of interest is {{{2*$pi}}}.
=========================
I want that to export as:
The value of interest is 6.28318.
Of course I made up that {{{}}} syntax, that's not a real thing. I've seen org-mode tables with calc, but I'm hoping for something simpler, just inline math expression eval. (I'm fine with elisp, calc, whatever.)