单词：cosine function
cosine function的用法和样例：
例句
- The inverse function of that restricted cosine function is called the arccosine function.被限定的余弦函数之反函数叫做反余弦函数。
- Let's now examine the simplest wave from where the profile is a sine or cosine curve.现在让我们来考察最简单的波形，它的剖面图是正弦或余弦曲线。
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