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深入研究圆锥曲线,我们会发现有趣的图形和性质.1 形影相伴的“情侣”曲线若双曲线C_1的弦PQ和实轴AA′所在直线垂直,
In-depth study of the conic curve, we will find interesting graphics and properties. 1 “couple” curve accompanied by shadows if the PQ of the hyperbola C_1 and the real axis AA’ are perpendicular to each other,