Factorize: x2−y2−2y−1x^2 - y^2 - 2y - 1x2−y2−2y−1
(x−y−1)(x+y+1)(x-y-1)(x+y+1)(x−y−1)(x+y+1)
(x−y+1)(x+y−1)(x-y+1)(x+y-1)(x−y+1)(x+y−1)
(x−y−1)2(x-y-1)^2(x−y−1)2
Cannot be factored