In this paper,the cosine law of general closed planar broken line is acquired by generalizing cosine law of triangle.
将三角形中的余弦定律进行推广,得到一般平面封闭折线的余弦定律。
In this paper, a instantaneous first-harmonic current detecting method based on cosine FIR filter is introduced .
文章提出了一种基于有限长余弦型单位脉冲响应滤波器的实时基波电流检测方法。