(a²+b²) (a²+b²) -(a²-b²) (a²-b²)
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(a² - b²)(a² + b²) - (a²- b²)²
= (a²)²-(b²)² -(a²-b²)²
= a⁴-b⁴-(a⁴-2a²b²+b⁴)
= a⁴-b⁴-a⁴+2a²b²-b⁴
= -2b⁴+2a²b²
= -2(b⁴-a²b²)
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