1.X²(x-y)=(y-x) 2.a²-2ab+b²-1

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1.X²(x-y)=(y-x) 2.a²-2ab+b²-1
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1.X²(x-y)=(y-x) 2.a²-2ab+b²-1
1.X²(x-y)=(y-x) 2.a²-2ab+b²-1

1.X²(x-y)=(y-x) 2.a²-2ab+b²-1