ab(x^2 + y^2 ) - xy (a^2+ b^2)
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Answer:
ab(x² + y²) — xy(a² + b²)
⇒ abx² + aby² — a²xy — b²xy
⇒ abx² + b²xy + aby² − a²xy -
=>bx(ax — by) — ay(ax — by) -
⇒ (ax − by)(bx - ay)
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