cosinen.[数]余弦cosine-fourth law余弦四次方定律cosine oscillations余弦振荡Cosine fringe field余弦条纹场cosine distribution余弦分布cosine emission law余弦发射定律cosine chirp filter[计] 余弦线性调频脉冲滤波器cosine tooth profile余弦齿廓cosine-Gauss pulse余弦-高斯脉冲cosine trigonometric三角余弦cosine -fourth law余弦照度定律