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feixiaolin

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6Â¥: Originally posted by qiang0107 at 2015-05-08 16:50:05
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Ô­¼¶Êý = Sum[n*a^2/( a^2+n^2)^2, {n, 0, inf}] - Sum[n^3/( a^2+n^2)^2, {n, 0, inf}]
a!=0, ǰһ¸ö¼¶ÊýÊÕÁ²; ºóÒ»¸ö²»ÊÕÁ²
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8Â¥2015-05-08 17:26:09
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feixiaolin

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2Â¥2015-05-08 11:24:45
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hank612

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qiang0107(feixiaolin´ú·¢): ½ð±Ò+7 2015-05-08 17:31:14
http://people.reed.edu/~jerry/311/cotan.pdf

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We_must_know. We_will_know.
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qiang0107

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2Â¥: Originally posted by feixiaolin at 2015-05-08 11:24:45
http://www.wolframalpha.com/inpu ... n%2C+0%2C+inf%7D%5D
Digamma function   http://en.wikipedia.org/wiki/Digamma

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