Question: plotting a function versus a geometric shape

Hi everybody:

I was wondering if there's a tool in maple that would allow you to plot a function f(x,y) over a geometric shape (e,g,, a triangle). Sort of like the Matlab logo if you know what I mean. Or even simpler: for x=0,y=0..10, sin(y), and y=10,x=0..10, sin(x)

thanks a lot

dimitrios

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