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Find the local maximum and minimum values and saddle point(s) of the function. You are encouraged to use a calculator or computer to graph the function with a domain and viewpoint that reveals all the important aspects of the function. (Enter your answers as comma-separated lists. If an answer does not exist, enter DNE.) f(x, y) = 6 -x4+ 2x2 - 12 local maximum value(s) X local minimum value(s) DNE saddle point(s) (x, y ) = X