factorise the following x2-y2-2y-1
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x2-y2-2y-1
(x2-2y-1)-y2
(x-1)^2-y2
(x-1+y)(x-1-y)
(x2-2y-1)-y2
(x-1)^2-y2
(x-1+y)(x-1-y)
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