Question

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Answer 1

Answer:

${x}^{2} + {y}^{2} - 2xy - {x}^{2} + {y}^{2}$

$= {x}^{2} + {y}^{2} - ( {x}^{2} + {y}^{2} - 2xy)$

${x }^{2} + {y}^{2} - {x}^{2} - {y}^{2} + 2xy$

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

$= 2xy$