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3. Prove or disprove: For integers a and b, if a|b, then a^2|b^2. 4. Suppose that...

3. Prove or disprove: For integers a and b, if a|b, then a^2|b^2.

4. Suppose that for sets A,B,C, and D,A∩B⊆C∩D and A⊆C\D. Prove that A and B are disjoint.

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