ab(x² + y²) - xy(a² + b²)
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Answer:
ab(x^2+y^2)-xy(a^2+b^2)
=abx^2+aby^2-xya^2-xyb^2.
=abx^2 -xya^2+aby^2 -xyb^2.
=ax(bx-ay)+by (ay-bx).
=ax(bx-ay) -by(bx-ay).
=(ax-by) (bx-ay)
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