Find the relative maximum and minimum values. [6.3] 23. f(х, у) 3 х3 - бху + у2 + бх + Зу - } 24. f(x, y) = x2 + y² + 6x – 12 25. f(х, у) %3D 3х - бу- х2 -у2 26. f(x, y) = sin x + sin y + sin (x + y)

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