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(2x+3y)²-(2x+y)(2x-y)
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(2x+3y)²-(2x+y)(2x-y)
=4x^2+12xy+9y^2-(4x^2-y^2)
=4x^2+12xy+9y^2-4x^2+y^2
=12xy+10y^2
=2y(6x+5y)
=2*(-1/2)*(6*1/3+5*(-1/2))
=-(2-5/2)
=1/2
=4x^2+12xy+9y^2-(4x^2-y^2)
=4x^2+12xy+9y^2-4x^2+y^2
=12xy+10y^2
=2y(6x+5y)
=2*(-1/2)*(6*1/3+5*(-1/2))
=-(2-5/2)
=1/2
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