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
；并得到了计算
立叶系数一
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；并得到了计算立叶系数一方法.
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