simplify :(x+y) (2 x2 + y) + (x+ 2y ²) (x-y)
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( x + y ) ( 2x + y ) + ( x + 2y² ) ( x - y )
= x (2x+y) +y ( 2x+y) +x ( x−y)+ 2y (x−y)
=2x² +xy+2xy+y² +x ² −xy+2xy−2y²
=(2+1) x² + ( 1+2−1+2 ) xy+ ( 1−2)y²
=3x² +4xy−y² .
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