你知道这仅仅是正弦，余弦和正切的。

And you know this is just what sine, cosine, and tangent are.

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例如，清单3展示了一个样式表，它生成角度的正弦、余弦和正切值。

For example, Listing 3 shows a stylesheet that generates sines, cosines, and tangents for the angles.

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双曲正弦、双曲余弦和双曲正切函数也会以常见或特殊形式出现在各种计算中。

The sinh, cosh, and tanh functions also all appear in various calculations in special and general relativity.

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Then you're supposed to know derivatives of simple functions like sines and cosines.

你应该知道一些简单函数的导数,比如正弦函数和余弦函数

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sine and cosine are definite numbers.

正弦和余弦都是有限大小的数

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But since sine square plus cosine square is 1, you'll find this vector has a fixed length R.

但是由于正弦和余弦的平方和为1,你会发现这个矢量模长恒等于 R

耶鲁公开课 - 基础物理课程节选