x 2-4x-y 2-6y-5, x 2-y 2-1.5 x-y, xy- 4x 5 / x 2 -xy, 5x-3y x+2y, y x2-5x-6, 5x+y 2 x-3y 4, 5x2-6 x y+5y2 128, y x 2-4x+5, 5x-2y -3 -2x-y -6, 3x2+5xy-2y2-x+5y-2, x2-xy-2y2-4x+5y+3, 5x+y 3 5y+x 2, x 2-5x+5, x 2-x y+5 -4y-9, 5x+2y 20, x-y 2+5 x-y -50, 5x2-4xy+y2-2y+8x+3, y x+5/2, 5x+y + x+2y, 5xy2 + 15x2y3 - 35 xy, x/y-y/x 5/6 x2-y2 5, 2x2-3xy-2y2+5x+5y-3, 2x+5y 3x-2y
x 2 -y 2 -5x 5y. There are any references about x 2 -y 2 -5x 5y in here. you can look below.
x 2-4x-y 2-6y-5
x 2-y 2-1.5 x-y
xy- 4x 5 / x 2 -xy
5x-3y x+2y
y x2-5x-6
5x+y 2 x-3y 4
5x2-6 x y+5y2 128
y x 2-4x+5
5x-2y -3 -2x-y -6
3x2+5xy-2y2-x+5y-2
x2-xy-2y2-4x+5y+3
5x+y 3 5y+x 2
x 2-5x+5
x 2-x y+5 -4y-9
5x+2y 20
x-y 2+5 x-y -50
5x2-4xy+y2-2y+8x+3
y x+5/2
5x+y + x+2y
5xy2 + 15x2y3 - 35 xy
x/y-y/x 5/6 x2-y2 5
2x2-3xy-2y2+5x+5y-3
2x+5y 3x-2y
x 2-4x-y 2-6y-5, x 2-y 2-1.5 x-y, xy- 4x 5 / x 2 -xy, 5x-3y x+2y, y x2-5x-6, 5x+y 2 x-3y 4, 5x2-6 x y+5y2 128, y x 2-4x+5, 5x-2y -3 -2x-y -6, 3x2+5xy-2y2-x+5y-2, x2-xy-2y2-4x+5y+3, 5x+y 3 5y+x 2, x 2-5x+5, x 2-x y+5 -4y-9, 5x+2y 20, x-y 2+5 x-y -50, 5x2-4xy+y2-2y+8x+3, y x+5/2, 5x+y + x+2y, 5xy2 + 15x2y3 - 35 xy, x/y-y/x 5/6 x2-y2 5, 2x2-3xy-2y2+5x+5y-3, 2x+5y 3x-2y
