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
微分的公式；并得到了计算
立叶系数的一种简便方法.
地(的)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微分的公式；并得到了计算立叶系数的一种简便方法.
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