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Question 1. Determine whether the two-variable function f (x, y) is convex, strictly convex, or not. (1) f(x, y) = In(ex + ey) (2) f(x,

Question 1. Determine whether the two-variable function f (x, y) is convex, strictly convex, or not. (1) f(x, y) = In(ex + ey) (2) f(x, y) = xy (3) f(x, y) = ex2ty2 Question 2. Determine whether the region is convex or not. (1) { (x, y) | 22 + y?

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