Sketch the region in the plane defined by each of the following equations. (a) [x]2 + [y]2

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Sketch the region in the plane defined by each of the following equations.
(a) [x]2 + [y]2 = 1 (b) [x]2 – 1 [y]2 = 3 (c) [x + y]2 = 1 (d) [x] + [y] = 1
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