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What I think POV *should* do is not include these areas in the graph. Say I
want to graph a hemisphere on my TI-89, I do x^2+y^2+z^2=1, z^2=-x^2-y^2+1,
z=sqrt(1-x^2-y^2), and graph it and it gives me my hemisphere, and the area
*outside* the hemisphere is ignored (not rendered) because it is sqrt(neg).
Because if people want it to work the other way they can always just make
it sqrt(abs(x)) instead of sqrt(x).
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