4.Find the absolute maximum value of f(x,y) = 
(x2 + 2y2) on the set D,where D is the disk x2 + y² ≤ 4.
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4.Find the absolute maximum value of f(x,y) = (x2 + 2y2) on the set D,where D is the disk x2 + y² ≤ 4.