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12Â¥: Originally posted by MANUTD1314 at 2015-05-09 00:38:51
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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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2Â¥: Originally posted by feixiaolin at 2015-05-08 11:24:45
http://www.wolframalpha.com/inpu ... n%2C+0%2C+inf%7D%5D
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