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
的和函
敛域内可以逐项微分的公式；并得到了计算傅立
系的一种简便方法.
} power seriesA 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的和函敛域内可以逐项微分的公式；并得到了计算傅立系的一种简便方法.
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