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- Show that the line normal to the surface xy + z = 2 at the point (1, 1, 1) passes through the origin.Find the points on the surface x² −yz = 5 that are closest to the origin.Suppose that the Celsius temperature at the point (x, y, z) on the sphere x2 + y2 + z2 = 1 is T = 400xyz2. Locate the highest and lowest temperatures on the sphere.