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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.

用比较直接的方法证明幂级数的和函数在收逐项微分的公式;并得到了计算傅立叶系数的一种简便方法.

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achoricine, achorion, ACHR, Achras, Achreioptera, achrematite, achreocythemia, achrestic, achroa, achroacyte,

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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迪伊河沿岸一系列玉米供动力,该市供了稳定面粉供应,并雇用了大量人员。

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achromacyte, achromasia, achromasie, achromat, achromate, Achromatiaceae, achromatic, achromatic color, achromatic lens, achromaticity,

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3G, 401(K), a,
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