(a+b)^2-(a-b)^2
a^2+b^2+2ab-(a^2+b^2-2ab)
a^2+b^2+2ab-a^2-b^2+2ab
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(a+b)^2-(a-b)^2
a^2+b^2+2ab-(a^2+b^2-2ab)
a^2+b^2+2ab-a^2-b^2+2ab
= 4ab
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