9. f (x, y) = =2 + + 2xy Answer Minima f = 2 V2 saddle point at (0, 0)5, 6, 7, 8, 2, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 and 20 Find the local maximum and minimum values and saddle point(s) of the function. If you have three-dimensional graphing software, graph the function with a domain and viewpoint that reveal all the important aspects of the function