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2Â¥2015-02-02 19:45:49
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2Â¥: Originally posted by feixiaolin at 2015-02-02 19:45:49
http://www.wolframalpha.com/input/?i=Integrate%5Bcos%28x%29+%2F%281%2B+x%5E2%29%5D&dataset=

22.PNG

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3Â¥2015-02-02 20:03:40
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