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n¡ú¡Þ  (1+1/1^2)(1+/2^2)(1+/3^2)(1+1/4^2)¡­¡­=(e^¦Ð-e^(-¦Ð))/(2¦Ð)

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2Â¥2014-10-27 11:19:53
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³ÂÒåchenyi: ½ð±Ò+10, ¡ï¡ï¡ïºÜÓаïÖú 2014-10-28 02:05:40
feixiaolin: ½ð±Ò+15, ½±Àø http://emuch.net/bbs/viewthread.php?tid=8144730&fpage=1 Ó¦Öú£¬´úcooooldog·¢ 2014-11-12 19:19:27
ÒýÓûØÌû:
2Â¥: Originally posted by ³ÂÒåchenyi at 2014-10-27 11:19:53
´ò´íÁË
n¡ú¡Þ  (1+1/1^2)(1+/2^2)(1+/3^2)(1+1/4^2)¡­¡­=(e^¦Ð-e^(-¦Ð))/(2¦Ð)

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We_must_know. We_will_know.
3Â¥2014-10-28 01:52:50
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½ð³æ (ÖøÃûдÊÖ)

ÒýÓûØÌû:
3Â¥: Originally posted by hank612 at 2014-10-28 01:52:50
ÖÚËùÖÜÖª Weierstarss-Hadamard ÑÇ´¿º¯ÊýÎÞÇîÁ¬³ËÕ¹¿ªÊ½
\frac{\sin{z}}{z}=\prod_{n=1}^{\infty} (1-\frac{z^2}{n^2\pi^2})
ÄÇô, Èà z=i\pi , ÒòΪ˫ÇúÕýÏÒ¶¨Òå \sinh{z}=-i\sin(iz)=\frac{e^z-e^{-z}}{2}, Á¢ ...

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4Â¥2014-10-28 02:02:27
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