factorise x square-1-2y-y square
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x^2-1-2y-y^2
=x^2-(1+2y+y^2)
=x^2-(1+y)^2
={x+(1+y)}{x-(1+y)}
=(x+y+1)(x-y-1)
=x^2-(1+2y+y^2)
=x^2-(1+y)^2
={x+(1+y)}{x-(1+y)}
=(x+y+1)(x-y-1)
ashvinder:
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