factorise x^2-y^2-2y-1
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X^2-(y^2+2y+1^2)
x^2-(y+1)^2
{x-(y+1)} {x+(y+1)}
(x-y-1)(x+y+1)
x^2-(y+1)^2
{x-(y+1)} {x+(y+1)}
(x-y-1)(x+y+1)
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