factorise : (a^2-1)(b^2-4c^2)^2-4a^2b^2
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(a²+b²-c²)-4a²b²
= (a²+b²-c²)-(2ab)²
=(a²+b²-c²-2ab)(a²+b²-c²+2ab)
=(a²+b²-2ab-c²)(a²+b²+2ab-c²)
=((a-b)²-c²)((a+b)²-c²)
=(a-b-c)(a-b+c)(a+b-c)(a+b-c).
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