一些人需要复习一点数学课程，正弦的作用是给出在一个直角三角形中的一个已知角所对应的一条边与直角三角形斜边之间的比率。
For anyone that needs a little refresher course, the sine function gives the ratio of the opposite side of a given Angle in a right triangle to the hypotenuse.
同时，建立了反余弦一波正弦形缓和曲线的设置方法和计算公式。
This article puts foward a "Secant One—wave Sine—shaped Transition Curve", whose deflection angles are of secant varlation.
该装置不仅适用于不同规格的正弦形波纹式橡胶套而且适用于左(右)旋螺纹式橡胶套的生产，适用面较广。
The facility is widely applied rubber case production for either sine corrugated rubber case production or left (right) spiral rubber case production.
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