ab ( x square + y square ) - xy ( a square + b square )
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=ab(x²+y²)-xy(a²+b²)
=abx²+aby²-xya²-xyb²
=abx²-xya²+aby²-xyb²
=ax(bx-ay)+by(ay-bx)
=abx²+aby²-xya²-xyb²
=abx²-xya²+aby²-xyb²
=ax(bx-ay)+by(ay-bx)
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