Please write down ALL the identities that are used in the Polynomials chapter.
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1. (x+b)^2 = x^2 + 2xy + y^2
2. (x-y)^2 = x^2 - 2xy + y^2
3. x^2 - y^2 = (x+y) (x-y)
4. (x+a)(x+b)= x^2 + (a+b) x + ab
2. (x-y)^2 = x^2 - 2xy + y^2
3. x^2 - y^2 = (x+y) (x-y)
4. (x+a)(x+b)= x^2 + (a+b) x + ab
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