Consider the following MWE, which typesets some sans serif math that I'm using in a presentation:
\documentclass{article}
\usepackage{sansmath}
\usepackage{amsmath}
\begin{document}
\sansmath
\[
w\Delta z = \operatorname{cov}(w,z) + \operatorname{E}(w\Delta z),
\]
\end{document}
The result looks like this:
I think it would look a lot better if the Delta characters were upright instead of italic. How can I achieve that? (I like the w and z being italic, just not the deltas.)
If the solution involves using a different package than sansmath, or a different font than the one shown, I'm fine with that - I'm just looking for a quick easy way to make sans serif math that looks good.
Although I already mentioned it in both the title and the body of the question, and demonstrated it with an MWE, I apparently have to edit this to point out that I am looking to do this in a sans serif font, which is what makes this different from the linked question.
upgreek
package from the answers to that question does work for me, though.