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1·Vector, Statistics, Probability, Mapping, Transformation, Sine and Cosine Law, Functions.

向量；统计；概率；映射；变换；正弦与余弦定理；函数。

2·In this paper, the cosine law of general closed planar broken line is acquired by generalizing cosine law of triangle.

将三角形中的余弦定律进行推广，得到一般平面封闭折线的余弦定律。

3·The results show that backward electron emission yield deviates from inverse cosine law, due to the role of the valence electrons of H2 +.

研究发现背向的电子发射产额不满足余弦关系，这是由于H2 +上的价电子所引起的。

4·In this paper, we generalized the Pythagorean Theorem and Cosine law from the new point and we have got a few the simple proper USES of the result that we have made.

本文给出了两个定理：从一个新的角度推广了勾股定理与余弦定理：另外我们还给出了这两个定理的若干简单应用。

5·Based on the equivalent theory of statics this paper presents an accurate numerical method and accurate numerical formulas for calculating the bearing load distributed by cosine curve law are derived.

本文根据静力学完全等效原理提出一种精确数值解法，并对余弦分布的轴承负荷转为节点力的解法作了具体的数学推导，得出了精确数值计算公式。