(d/dx {x, y, sqrt(1 - x^2 - y^2)}) cross (d/dy {x, y, sqrt(1 - x^2 - y^2 )})(d/dx {x, y, sqrt(1 - x^2 - y^2)}) cross (d/dy {x, y, sqrt(1 - x^2 - y^2 )})

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