(x+2)2 - x2+4x+4, (2x+3)2 - 4x2+12x+9, (x+y)2 - x2+2xy+y2, (x+2y)2 - x2+4xy+4y2, (y2+y)2 - y4+2y3+y2, (2α+β)2 - 4α2+4αβ+β2,

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