名词
中文翻译：自然余弦
同义词：
['natural tangent', 'natural cotangent例句：1. The angle between two lines in a plane is the natural cotangent of the line segments.（平面上两条线之间的角是线段的自然余弦。）']
例句：
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1. The angle between two lines in a plane is the natural cotangent of the line segments.
平面上两条线之间的角是线段的自然余弦。
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2.The natural cotangent of a circle is its radius.
圆的自然余弦是其半径。
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3.The natural cotangent of a triangle is the length of the median chord.
三角形的自然余弦是中线的长度。