Factorise:
(a) x^2 - y^2 - 2y - 1
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x^2 - y^2 - 2y - 1
=x^2 - (y^2 +2y +1)
=x^2 - (y+ 1)^2
=(x-(y+1))((x+(y+1))
=(x-y-1)(x+y+1)
=x^2 - (y^2 +2y +1)
=x^2 - (y+ 1)^2
=(x-(y+1))((x+(y+1))
=(x-y-1)(x+y+1)
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