Question: Inserting math expressions into plots

While looking at a Maple demonstration, it appeared to me that a intricate math expression was cut and pasted or dragged somehow into the text field, or next to a text field of a plot to become part of its documenation.  The demo went so fast.  When I try that, it does not work.  I can easily annotate the plot with text and math expressions if I type the math expressions manually, but I was hoping to bring the math expression in from somewhere outside of the plot.  Is that wishful thinking, or is it possible?  Ratch

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