a2+2ab+b2 and a2-2ab+b2
any irrelevant answer will be immediately reported
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Answer:
(a+b+2ab)-(a^2+b^2-2ab)
a^2+b^2+2ab-a^2-b^2+2ab
a^2-a^2+b^2-b^2+2ab+2ab
4ab
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