(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
Answer = -4xy
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