Define g, h: {x€R2} |x| ≤ 1} →R by g(x,y) = (x,y, &

Define g, h: {x€R2} |x| ≤ 1} →R by
g(x,y) = (x,y, √1-x2-y2),
h(x,y) = (x,y, - √1-x2-y2),
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