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0. Let R denote the set of real numbers. Let f: R x R → R x R be a bijective function deined by f(x, y) = (x + y, x - y).
The inverse function off is given by
f -1(x,y) = (x - y, x + y)
f-1(x,y)=[2(x - y), 2(x + y)]
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