(x+y)(2x+y)+(x+2y)(x-y)
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the answer is
= 2x²+xy+2xy+y²=x²-xy+2xy-2y²
=3x²+4xy-y²
= 2x²+xy+2xy+y²=x²-xy+2xy-2y²
=3x²+4xy-y²
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