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' W = xy 23 calculate the values of and the total differential when dw (x, y, z) goes from to (3,2,1) (2.9, 2.1,

' W = xy 23 calculate the values of and the total differential when dw (x, y, z) goes from to (3,2,1) (2.9, 2.1, 1.05) Round your answer for to three decimal places. 10] 4. Find both points on the surface XZ x - y y = 8 where the tangent plane is horizontal.

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