Find the boundary and the interior of each of the following subsets of :
(a) A = {x × y|y = 0}
(b) B = {x × y|x > 0 and y ≠ 0}
(c)
(d) D = {x- × y|x is rational}
(e) E = {x × y|0<x2 − y2 ≤ 1}
(f) F = (x × y|x ≠ 0 and y ≤ 1/x}
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