I'd like to use implicit_plot on a function that involves a square root. When I do, I get an error message saying that for some values of x and y the number inside the square root is negative. Well, sure. Is there a way to restrict implicit_plot to the region where the function has real values? In this the thing in the square root is 1-u^2-v^2, so I'd like to restrict u and v to the unit circle.
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