x+y2x+y
x+y2x−y
x−y2x−y
x−y2x+y
Correct answer is C
x2−y22x2+xy−y2
2x2+xy−y2=2x2−xy+2xy−y2
= x(2x−y)+y(2x−y)
= (x+y)(2x−y)
x2−y22x2+xy−y2=(x+y)(x−y)(x+y)(2x−y)
= x−y2x−y
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