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
方法证明幂级数和函数在收敛域内可以逐项微分公
；
到了计算
立叶系数
简便方法.
)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.
用比较直接方法证明幂级数和函数在收敛域内可以逐项微分公；到了计算立叶系数简便方法.
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