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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.

用比较直接的方法幂级数的和函数在收敛域可以逐项微分的公式;并得算傅立叶系数的一种简便方法.

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nightstand, night-startlings, nightstick, nightstool, night-suit, night-television, night-terrors, nighttide, nighttime, night-time,

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3G, 401(K), a,

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记忆旅行者

His workers channelled the water to allow it to power a series of corn mills along the Dee providing the city with a steady supply of flour and employing a large number of people.

工人们将这些水引导起来,河沿岸一系列坊提供动力,该市提供了稳定面粉供应,并雇用了大量人员。

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nightwork, nightworks, nighty, nighty-night, nigiri, nigisu, nigra, nigraniline, nigrascale, nigrate,

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3G, 401(K), a,
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