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If a x^2+2h x y+b y^2+2gx+2f y+c=(l x+m ...

If `a x^2+2h x y+b y^2+2gx+2f y+c=(l x+m y+n)(l prime x+m^(prime)y+n^(prime)) and Delta_1=|(l,l prime,0),(m,m prime,0),(n,n prime,0)|and Delta_2=|(l prime,l,0),(m prime,m,0),(n prime,n,0)|,` then the product `Delta_1 Delta_2` is

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