Question: custom latex representation for functions - how to show what is currently set up?

The documentation shows that one can set up custom latex form for different function/variables:

This is very nice, but how do I see what's currently set? 

I was hoping something like:
would work, but these don't.

I would like to simply copy/paste what maple already does and only make slight adjustments - don't want to have to write these from scratch. 


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