Define f(x, y) = 9a? + y². (1) Sketch the level curve of this function for z=36. Draw it on an xy-plane. (2) Find the gradient Vƒ at the point (2,0) and the point (0, 6). (3) Sketch the graph (surface) of this function using f(x, y) as the z-coordinate. Show all your work on your own paper. You may leave the box below blank.

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