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yanxingsun(½ð±Ò+4):LÂ¥ÉϽâ´ðÁËлл²ÎÓë 2010-10-10 08:56:15
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yanxingsun(½ð±Ò+16):²»À¢ÎªÊýѧϵµÄ£¬Å£B 2010-10-10 08:55:51
cothx ~ 1/x+x/3-x^3/45
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coth(x)=(e^x-e^{-x})/2
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