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

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term1=(x-y)*(x-y)=x^2 -y^2 -2xy term2=(2y*(x+y) =2xy+2y^2 term3 = -x^2 +y^2 add em up (x^2 -x^2) + (2xy-2xy) +(-y^2 +y^2 +2y^2) =2y^2
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