(3x-y)(3y+x)-(x-y)(x+y)
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(3x-y)(3y+x)-(x-y)(x+y)(3x-y)(3y+x)-(x-y)(x+y)(3x-y)(3y+x)-(x-y)(x+y)(3x-y)(3y+x)-(x-y)(x+y)=9xy+3x&
(3x-y)(3y+x)-(x-y)(x+y)
(3x-y)(3y+x)-(x-y)(x+y)
(3x-y)(3y+x)-(x-y)(x+y)
(3x-y)(3y+x)-(x-y)(x+y)
=9xy+3x²-3y²-xy-(x²-y²)
=3x²+8xy-3y²-x²+y²
=2x²+8xy-2y²
(3x-y)(3y+x)-(x-y)(x+y)
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x>y?x:y