8x2 + 7xy – 6y2, 4x2 – 3xy + 2y2 and -4x2 + xy – y2
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8x^2+ 7xy -6y^2+ 4x^2 - 3xy +2y^2 -4x^2 +xy - y^2
12x^2 -4x^2 +8xy -3xy -8y^2 +2y^2
8x^2 + 5xy -6y^2
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