摘要
利用逐项积分或逐项求导的方法求出复变函数幂级数 的和函数f(x),取z=eix,比较 两端的实部与虚部可以得到三角级数 及 的和函数,从而解决了三角级数求和问题。
In this paper, the method of derivative or integral calculus is applied to solve the problem of
sum function of the complex variable power series: . While z=eix compare real unit and imagine u-
nit of the two ends equation. , and we can obtain the sum functions of triangular progres-
sion cosnx and sinnx. Therefore, the problem of summing the triangular progression is solved?
出处
《陕西科技大学学报（自然科学版）》
2003年第5期67-69,共3页
Journal of Shaanxi University of Science & Technology
