expand using identity : (-x/2+y+1/4)^2
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(-x/2+y+1/4)^2
=x^2/4+y^2+1/4) (a+b+c)^2=a^2+b^2+c^2)
=x^2/4+y^2+1/4) (a+b+c)^2=a^2+b^2+c^2)
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