(2x +y) ( 2x - y) - ( 2x + y) ²
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(2x+y)(2x-y)-(2x+y) square
=4x*x+2xy-2xy-y*y-( 4x*x+y*y+8xy)
=8xy
=4x*x+2xy-2xy-y*y-( 4x*x+y*y+8xy)
=8xy
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