(a^2+b^2)^2 - (a^2-b^2)^2
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Step-by-step explanation:
(a²+b²)²-(a²-b²)²
= (a²+b²+a²-b²)(a²+b²-a²+b²)
= (2a²)(2b²)
= 4 a²b²
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