Find all critical points of f(x,y) = x²-y-4y+xy and classify each as yielding local max., local min., or saddle points. Show how you arrive at your conclusions. You do not need to find the

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A: Formula:Period of Since tan(x) period is  , so the period of  is          (  here b = 4 )Graph:

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A: please refer to the attached images.Explanation:

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