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6. Below are four contour plots of the form z=f[x,y). Identify which one corresponds to f{x.y) = 21.12? + xy. then draw and label at

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6. Below are four contour plots of the form z=f[x,y). Identify which one corresponds to f{x.y) = 21.12? + xy. then draw and label at least two contourlines and draw the gradient at one point ofyour choice (you do not need to compute anything more for the gradient]. [15 marks]

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