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为叙述方便起见,茲规定椭圆的中心在原点,长、短轴分别在x,y轴上,在x轴上的半轴用a表示,在y轴上的半轴用b表示。中心与椭圆上的点的联线称为矢径,用l表示。x轴的正半轴旋转角α(按习惯规定正负)能与l重合,则称α为矢径l的矢角。夹角为π/2的两条矢径称为共余矢径,用l与l_1表之。共轭直径上的两条矢径称为共轭矢径,用l与(?)表之。Ⅰ.关于椭圓矢径的几个定理
For the sake of narrative convenience, it is specified that the center of the ellipse is at the origin, the long and the short axes are respectively on the x, y axes, the half axes on the x axis are denoted by a, and the half axes on the y axis are denoted by b. The line between the center and the point on the ellipse is called the radial vector, denoted by l. The x-axis positive half-axis rotation angle α (positive and negative as stipulated by convention) can coincide with l, and α is said to be the sagittal angle of the vector diameter l. The two vectors with an angle of π/2 are called the co covariance vector and are represented by l and l_1. The two diameters on the conjugate diameter are called conjugate vectors, and are represented by l and (?). I. Several theorems on the elliptic radial vector