cos(x) meaning in English

曲线

The main results achieved in this thesis can be summarized as follows : 1 . by means of the fourier series expansion , an approximate analytical propagation equation of flattened gaussian beams ( fgbs ) passing through an apertured paraxial abcd optical system is derived , and illustrated with numerical examples , when the transmissivity of the aperture is t ( x ) = cos ( x )
用傅立叶级数展开法研究了平顶高斯光束通过有光阑限制的近轴abcd光学系统的传输特性，导出了光阑透射率为t ( x ) = cos ( x )时的近似解析传输公式，硬边光阑的情况可作为= 0的特例得到。