X = R² and = = { $₁x} V { \\x>0} where U4 = {(x,y) | x² + y² <²} Prove (x, t) is Topology

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Q: (a) A\B=A\(ANB) (b) A\(B\C) = (A\B)U(ANC) (c) (A\B)\C=A\(BUC)

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