A relatively direct method is expounded in this paper to prove the termwise differentiation of power series, and a simple method is expressed to calculate the Fourier coefficient.
用比较直接的方法证明幂级数的和函数在收敛域
可以逐项微分的
式；并得到了计算傅立叶系数的一种简便方法.
幂级数
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