Sunday 16 May 2010 photo 1/1
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(x+4y)^2-(x-4y)^2-16xy=
=x^2+8xy+16y^2-x^2+8xy-16y^2-16xy=
=0
=x^2+8xy+16y^2-x^2+8xy-16y^2-16xy=
=0
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