xx2−y2
y2x2−y2
x2x2−y2
yx2−y2
Correct answer is B
xx+y + yx−y - x2x2−y2
xx+y + yx−y - x2(x+y)(x−y
= x(x−y)+y(x+y)−x2(x+y)(x−y
= x2+xy+xy+y2−x2(x+y)(x−y
= y2(x+y)(x−y)
= y2(x2−y2)
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