Question: plot surface (x(eta,xi),y(eta,xi))


I have a area described by two functions x(eta,xi) and y(eta,xi) describing the x and y coordinate, respectively. I would like to plot this area for eta = -1..1, xi=-1..1. I have tried with plot([x, y], eta = -1 .. 1, xi = -1 .. 1, axes = boxed) but is does not work. How can i do this?

Thanks in advance.

Regards Brian 

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