要计算反正弦的表达式。

Expression to compute the arcsine of.

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这种偏离完全正弦的畸变称为电压、电流波形的谐波畸变。

This deviation from perfect sinusoids is usually expressed in terms of harmonics distortion of the voltage and current waveforms.

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通过分析得到整个电机电磁场的分布及波形近似为正弦的气隙磁感应强度，分析结果有助于对电机进行优化设计和控制。

A approximately sine waveform air-gap magnetic field density can be gained based on the analysis of the whole electromagnetic field. The results are helpful to optimization design and control.

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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

耶鲁公开课 - 基础物理课程节选

sine and cosine are definite numbers.

正弦和余弦都是有限大小的数

耶鲁公开课 - 基础物理课程节选

I'm using the fact that when you take a cosine and change the angle inside the cosine, it doesn't care. whereas, if you go to the sine and change the angle inside the sine, it becomes minus sine.

我用了一个结论,当你使用余弦函数时,改变角度的正负,函数值不变,而对于正弦函数,改变角度的符号,则函数值也会变号

耶鲁公开课 - 基础物理课程节选