x²-1-2y-y² factorise
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x²-1-2y-y²
=x²- (1+2y+y²)
=x²- (1+y)²
=(x+1+y) (x-1-y)
=x²- (1+2y+y²)
=x²- (1+y)²
=(x+1+y) (x-1-y)
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