For functions:f(x, y) = x − yg(x, y) = x2 + x − yDetermine whether the following sets are closed and bounded. If possible, make your graphs. a) GSg ∩ GIfb) GIg ∩ GSfc) CSg(1) ∩ CIf (2)d) CIg(1) ∩ CSf (2)

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