Question

$(x^2 - 2xy + y^2) + (x^2 - 2xy + y^2)$
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Answer 1

${x}^{2} - 2xy + {y}^{2} + {x}^{2} - 2xy + {y}^{2} \\ = 2 {x}^{2} - 4xy + 2 {y}^{2}$

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