find the sum of 2xsquare+xy-ysquare and -xsquare +2xy+3y square and 3x square -10xy +4y
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the sum of 2x^2+xy-y^2 and -x^2+2xy+3y^2 and 3x^2 -10xy +4y:-
2x^2+xy-y^2
-x^2+2xy+3y^2
3x^2 -10xy +4y
6x^2+3xy+4y^2
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