名词
中文翻译：切线向量
同义词：
['tangent vector', 'normal vector']
例句：
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1.The cotangent vector is a vector that points in the direction of the tangent to a curve at a point.
切线向量是指向曲线在一点处的切线方向的向量。
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2. In geometry, the cotangent vector is used to define the direction of the tangent vector at a point on a surface.
在几何学中，切线向量用于定义曲面上某点处切线向量的方向。
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3. The cotangent vector is also used in computer graphics to calculate the intersection points between two curves.
计算机图形学中，切线向量用于计算两条曲线的交点。