Question: How do I plot the following equation? f: R -> R^2 ...

How do I plot the following equations in Maple ?:

I already tried this: 

 

According to the given solution the plot should look like that: 

I think I have to tell maple that the function is defined from R^2 -> R, but I don't know how to do this. 

Thanks in advance for your kind help.

 

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