名词
中文翻译：余弦函数
同义词：
['cosine', 'cosine function例句：1. The sine wave is a type of wave that repeats itself in a cycle.（正弦波是一种周期性重复的波形。）']
例句：
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1. The sine wave is a type of wave that repeats itself in a cycle.
正弦波是一种周期性重复的波形。
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2. The graph shows the relationship between the sine and cosine of an angle.
图表显示了角度的正弦和余弦之间的关系。
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3. The sine function is used to find the length of a line segment in a coordinate system.
正弦函数用于在一个坐标系中找出线段的长度。