x2-y2 6 xy 4, x2-y2 6, xy 2/ x 2+y 4, x2+y2 2 4 x2-y2, x2+xy+y2 4, x2+y2+xy 4, x-2 y-2 4, x2+y2 4, x2+y2 2-4x2y2, x2y/ x4+y2, x2+4y2 4, x2-y2+x+5y-6, x2+y2 4x, x2-xy-6y2+2x-y+1, x2-4x+y2 0, x2-xy-2y2-4x+5y+3, x2+y2+4x-6y+13, x2+y2/4 1
x2-y2 6 xy 4. There are any references about x2-y2 6 xy 4 in here. you can look below.
x2-y2 6 xy 4
x2-y2 6
xy 2/ x 2+y 4
x2+y2 2 4 x2-y2
x2+xy+y2 4
x2+y2+xy 4
x-2 y-2 4
x2+y2 4
x2+y2 2-4x2y2
x2y/ x4+y2
x2+4y2 4
x2-y2+x+5y-6
x2+y2 4x
x2-xy-6y2+2x-y+1
x2-4x+y2 0
x2-xy-2y2-4x+5y+3
x2+y2+4x-6y+13
x2+y2/4 1
x2-y2 6 xy 4, x2-y2 6, xy 2/ x 2+y 4, x2+y2 2 4 x2-y2, x2+xy+y2 4, x2+y2+xy 4, x-2 y-2 4, x2+y2 4, x2+y2 2-4x2y2, x2y/ x4+y2, x2+4y2 4, x2-y2+x+5y-6, x2+y2 4x, x2-xy-6y2+2x-y+1, x2-4x+y2 0, x2-xy-2y2-4x+5y+3, x2+y2+4x-6y+13, x2+y2/4 1
