Question: Why these spineness(small triangles) appeared in some certain value?

> Why these spineness appeared in some certain value?for example

> But if x is not the value +-1.5,it doesnt appear.

> And some prismatical may lose some area in the acme

The same to plotting in maple

plot3d(x*sqrt(1-y^2)+y*sqrt(1-x^2), x = -1.5 .. 1.5, y = -1.5 .. 1.5)


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