(b) (8 points)Find at the point (x, y, z) = (2, -1, 1) if w = x² + y² + z², z³ - xy + yz + y³ = 1, and x and y are the independent variables.
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at the point (x, y, z) = (2, -1, 1) if w = x² + y² + z², z³ - xy + yz + y³ = 1, and x and y are the independent variables.