Question

xy(a^2+b^2)-ab (x^2+y^2)

Answer 1

hope it helps you.
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Answer 2

Hey here is your answer
=xya^2+xyb^2-abx^2-aby^2
=(xya^2-abx^2)+(xyb^2-aby^2)
=ax(ya-bx)+by(xb-ay)