It proves that the analytical equation is equivalent to the parametric equation under certain condition.

证明了在一定条件下解析方程与参数方程两种形式的等价性.

In the form of function of functions this article derives the parametric equation of cylinder helix the lead of which is of a linear change.

用复合函数的形式，汇出导程呈线性变化的圆柱螺旋线的参考方程。