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
和函在收敛域内可以逐项微分公式；并得到了计
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.
用比较直接方法证明幂级和函在收敛域内可以逐项微分公式；并得到了计一种简便方法.
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