cosine circle

例句：

1. 1. The circle of light around the sun is a perfect example of a cosine circle.
   围绕太阳的光线圆环是一个完美的余弦圆例证。
2. 2.The scientist used a cosine circle to calculate the distance between the two points.
   科学家使用余弦圆来计算两点之间的距离。
3. 3.The mathematician discovered a new formula for calculating the area of a circle using a cosine circle.
   数学家发现了一种新的公式，用于使用余弦圆计算圆形区域的面积。