(x+y)(x-y)=x²-y²
(x+y)(x-y)=x*x+x*(-y)+y*x+y*(-y)=x²-xy+xy-y²=x²-y²
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(x+y)(x-y)=x²-y²
(x+y)(x-y)=x*x+x*(-y)+y*x+y*(-y)=x²-xy+xy-y²=x²-y²