from the sum of 2 X square + 3 x y, - x square - xy minus y square and xy + 2 y square, subtract the sum of 3 x square minus y square and minus x square + xy + Y square
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2x^2+3xy-x^2 - xy- y^2+xy+2y^2=x^2+3xy+y^2
3x^2-y^2-x^2+y^2+xy=2x^2+xy
then
x^2+3xy+y^2-2x^2+xy=-x^2+2xy+y^2 Ans.
2x^2+3xy-x^2 - xy- y^2+xy+2y^2=x^2+3xy+y^2
3x^2-y^2-x^2+y^2+xy=2x^2+xy
then
x^2+3xy+y^2-2x^2+xy=-x^2+2xy+y^2 Ans.
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sum of xy and -3xy issues is
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