Then cosinetheorem is no longer a pure problem from elementary geometry.
于是余弦定理从此不再是一个纯粹的初等几何问题。
2
By discussing the filter product cosine operator function and the spectrum of it 's generator, the spectral mapping theorem for the locally equicontinuous cosine operator function is established.
通过对滤子积余弦算子函数及生成元谱性质的讨论，建立了局部等度连续余弦算子函数的谱映象定理。
3
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.