What should be added to x^2+y^2 to get x^2+y^2 + 2xy
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x^2+y^2+2xy-(x^2+y^2)
x^2+y^2+2xy-x^2-y^2
2xy
2xy should be added to x^2+y^2 to get x^2+y^2+2xy
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