Simplify

(x-y)^2 - (x+y)^2

(x-y)^2 - ( x + y ) ^2

= [ (x-y)(x-y) ] - [ ( x+y) ( x + y)]

= [ x^2 - xy - xy + y^2 ] - [ x^2 + xy + xy + y ^2 ]

= x^2 - 2xy + y ^2 - x^2 - 2xy - y^2

= -4xy

Answer = -4xy

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