Find the local maximum and minimum values and saddle point(s) of the function. If you have three-dimensional graphing software, of the function. (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) f(x, y) = y²-6y cos(x), -1≤x≤7 local maximum value(s) local minimum value(s) saddle point(s) (x. y. n)-

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