(i) Determine the maximum and minimum values of the function f(x,y)=(x^2-y^2)e^x^2+y^2 in the region defined by the inequality x^2+y^2≤4.   (ii) (a) Describe the properties of both the function and the region that guarantee that the problem in (i) has a solution. That is, what properties are required of the function and the region to be certain that the function actually attains a maximum value in the region?

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