A (x - y - 1)(x - y + 1)
B (x - y + 1)(x + y - 1)
C (x + y - 1)(x - y - 1)
D (x - y)(x + y + 1)
Correct Answer: Option B
x2-1-y(y-2)
=x2-1-y2+2y
= x2 - y2 + 2y - 1
=x2-(y-1)2
= (x+y-1)(x-y+1)
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