This paper studies derivatives of higher order about product of three functions, and obtains a group dependent derivative formulas.
研究了三个函数乘积的高阶导数，得到了一组相应的导数公式。
We obtain two formulas about the covariant derivative of the coordinate functions on the unit sphere in Eucdidean space.
得到了欧氏空间中，单位球面上坐标函数关于某一特定标架场的协变微分的两个等式。
The mathematics formulas of the displacement, The velocity, The acceleration and the derivative of acceleration were given. The properties of this motion law were analyzed and discussed.
给出了该运动规则的位移、速度、加速度及跃度（加速度的导数）的数学表达式及运动曲线，并对该运动规律的特点进行了分析与讨论。
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