factorise x^2-y^2+2x+1
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Take x square plus 2x plus
And we get x^2+2x+1-y^2
(x+1)^2-y^2
(x+1+y)(x+1-y)
And we get x^2+2x+1-y^2
(x+1)^2-y^2
(x+1+y)(x+1-y)
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