(a2 + b2) (a2+ b2) – (a2– b2) (a2 – b2)
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(a²+b²)(a²+b²)-(a²-b²)(a²-b²)
a²+2ab+b²+a²+b²+2ab-a²+2ab-b²+a²-2ab+b²
3a²+6ab+3b²
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Answer:
(a²+b²)(a²+b²)-(a²-b²)(a²-b²)
a²+2ab+b²+a²+b²+2ab-a²+2ab-b²+a²-2ab+b²
3a²+6ab+3b²
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