nts] "Prove" (using graphs if necessary) whether the set {(x, y): x = 0 or y=0} < R² is: a closed set an open set a bounded set a compact set a convex set a concave set nts] "Prove" (using graphs if necessary) whether the set {(x, y): −1 < x <+1, y = 0} C R² is: a closed set

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