ab (x^2 + y^2) + xy (a^2 + b^2)
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abx
2
−aby
2
+xya
2
−xyb
2
abx
2
+xya
2
−aby
2
−xyb
2
ax(bx+ay)−by(ay+bx)
=(ax−by)(bx+ay)⇒(B)
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