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D^2 + E^2 - 4F > 0 인 모든 방정식 x^2 + y^2 + Dx + Ey + F = 0 이 원임을 보여라
D^2 + E^2 - 4F > 0 인 모든 방정식 x^2 + y^2 + Dx + Ey + F = 0 이 원임을 보여라
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