a^2+2ab+b^2-(a^2+ab-ab-b^2)=a^2+2ab+b^2-a^2-ab+ab+b^2=2b^2+2ab
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a^2+2ab+b^2-(a^2+ab-ab-b^2)=a^2+2ab+b^2-a^2-ab+ab+b^2=2b^2+2ab