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
可以逐
微分公式；并得到了计算
立叶系数一种简便方法.
(
)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可以逐微分公式；并得到了计算立叶系数一种简便方法.
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