特殊和■与■的注记

Note for special sums ■ and ■

讨论无界函数ｆ（ｘ）＝－Ｉｎ的付氏级数，通过逐项积分导出与特殊和的和．由于展开技巧较好，得到一种收敛较快的结果．

This papert first discusses a Fourier series expansion of the inboudey function f(x)= -in|2sin|.By using the method of successive integration to find out a sum of the two special sums. Because the expanding technique is better,we can get a quicker convergence.