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3. F(x,y,z)=4−x2−y2−z Find ∇F(x,y,z). Find ∇F(0,0,4) and draw that vector on the graph of f(x,y)=4−x2−y2. Find ∇F(0,1,3) and draw that vector on the graph of f(x,y)=4−x2−y2.