It's all open-source. These are powered by simple JSON files, you're welcome to submit a LaTeX Cheat Sheet :)

https://github.com/duckduckgo/zeroclickinfo-goodies/tree/mas...

I think we have over 200 cheat sheet now

If it's any consolation, there's a LaTeX quick lookup: https://duckduckgo.com/?q=latex+integral&ia=answer