Prove that the condition that the plane ux+vy+wz=0 may cuts rhe cone ax^2+by^2+cz^2=0 in perpendicu
Prove that the condition that the plane ux+vy+wz=0 may cuts rhe cone ax^2+by^2+cz^2=0 in perpendicular generators if (b+c)u^2+(c+a)v^2+(a+b)w^2=0

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