2x^2-3xy+(-y^2)-2x^2-(-5xy)+2y^2=?
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2x^2-3xy+(-y^2)-2x^2-(-5xy)+2y^2=?
2x^2-3xy+(-y^2)-2x^2-(-5xy)+2y^2=?
2x^2-3xy+(-y^2)-2x^2-(-5xy)+2y^2=?
=2X^2-3XY-Y^2-2X^2+5XY+2Y^2
=Y^2+2XY
2x^2-3xy+(-y^2)-2x^2-(-5xy)+2y^2
=-3xy-y²+5xy+2y²
=y²+2xy
=y(y+2x)
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x²-y²+5x+3y+4(x+y-2xy)(x+y-z)+(xy-1)²