(a2+ b2) (a2+ b2) - (a2- b2) (a2– b2)
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(a2+b2) (a2+b2) - (a2-b2) (a2-b2) (a2+b2)2-(a2-b2)2 (a2+b2-a2+b2) (a2+b2+a2-b2) 2b2×2a2 4a2b2
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