Question: Let f ( r ) = z - x 2 - y 2 . The equation f ( r ) = 0 describes a cup

Let f(r)=z-x2-y2. The equation f(r)=0 describes a cup-shaped surface S. Find the surface normal vector to the surface at point
Let f ( r ) = z - x 2 - y 2 . The equation f ( r

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