please solve third point please fast
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A : a+b+c
4x2 + y2 - 6 xy + 3y2+12x2+8xy+6x2 +8y2+6xy
22x2 + 21 y2 + 8xy
4x2 + y2 - 6 xy + 3y2+12x2+8xy+6x2 +8y2+6xy
22x2 + 21 y2 + 8xy
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