(a²-b²)(a²-b²)-( a²-b²)². simplyfy
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(a²-b²)(a²-b²)-(a²-b²)²
a⁴-a²b²-a²b²+b⁴-(a⁴-2a²b²+b⁴)
a⁴-2a²b²+b⁴-a⁴+2a²b²-b⁴=0
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I don't know whether it is right or not...
Hope it helps!
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