In Exercises 19-24, find the absolute maximum and minimum of the function subject to the given constraint. 23. f(x, y) = 4(x+ y) – (2x² + y), constrained to the square with vertices (0, 0), (3,0), (3, 3), and (0, 3).

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A: We will evaluate the double integral. 

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A: We will prove this by definition of limit as follows 

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A: Note that: cos x cos y-sin x sin y=cos (x+y)

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A: solution:-∑n=1∞-1n-12n!n!2.2nan=-1n-12n!n!2·2nan+1=-1n2n+1!n+1!2·2n+1Applying the ratio testL=limn→∞...

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