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本文先构造幂级数求其和函数或将给定函数展开成傅立叶级数,再在收敛域内给自变量取适当的值以得到数项级数的和.
In this paper, we first construct the power series to find the sum function and expand the given function into the Fourier series, and then take the appropriate values of the arguments in the convergence domain to get the sum of several series.