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xianjunlong

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1.  Éè S_n = k´Ó1µ½n×÷ºÍ arctan ( 1/(2³ËÒÔ  kµÄƽ·½)), Çó  S_n  µ± n Ç÷ÓÚÎÞÇî´óʱµÄ¼«ÏÞ¡£

[ Last edited by javeey on 2010-5-12 at 17:25 ]
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just_play

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Doctorcbw(½ð±Ò+1):лл 2010-05-09 11:19:41
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arctan1/(2 k^2)=arctan(1/(2k-1))-arctan(1/(2k+1))
So Trivial !
2Â¥2010-05-09 11:19:16
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xianjunlong

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bluesine:Â¥ÏÂ˵µÄºÜÇå³þÁË£¬¿´¿´°É£¬½á¹ûÒѾ­³öÀ´ÁË£¬pi/4 2010-05-09 12:42:15
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Originally posted by just_play at 2010-05-09 11:19:16:
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arctan1/(2 k^2)=arctan(1/(2k-1))-arctan(1/(2k+1))

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3Â¥2010-05-09 11:28:49
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just_play

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javeey(½ð±Ò+1):лл½â´ð 2010-05-09 11:54:21
ÒýÓûØÌû:
Originally posted by xianjunlong at 2010-05-09 11:28:49:


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So Trivial !
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