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.
用比较直法证明幂级数和函数在收敛域可以逐项微分公式;并得到了计叶系数一种简便法.
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And, in this case, it's an infinite polynomial so I should really be calling it a power series.
而且,在这下,它是一个限多项式,所的应该将其称为幂级数。
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