expansion of (sinx)/xcos x are (x^2)/3 and -(x^4)/(30) First non-zero terms of series expansion of 1-cosx are (x^2)/2 and -(x^4)/(24)44^4∵1/41/6=1/6-1/6=1/6Selects a method to determine the value of the limit by finding the first non-zero term of one ...
Expansion 清华大学 物理学博士 问题描述里面其实有很多问题。我尽我可能讲清楚,不一定办得到。 1)讨论之前,我们理解一下什么是守恒?守恒是说一个东西不随时间变化。比如电荷Q,如果满足 那么我们说电荷守恒。对于空间某一个区域,我们有 这里 表示的是空间 的电荷密度。如何区域V有限,那么如果 里面电荷减少,说明...
I. Formal Solution of the Helmholtz Equation on a Square To obtain the correct expansion forψ(x, y)on the square corner of the L shape whenk = 1, it is found necessary to replace terms sinkxsinyand sinxsinkyby sinxsinyand (xcosxsiny–ycosysinx). Terms similar to the latter ...