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hejie20081(½ð±Ò+2): ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸ ·Ç³£¸Ðл£¡ 2012-03-08 12:03:47
ÓÃÅ·À­¹«Ê½e^{-ixu}=cos(xu)-i*sin(xu),ÓÚÊÇe^{-ixu}-1=cos(xu)-1-isin(xu)=-2(sin(xu/2))^2-2isin(xu/2)*cos(xu/2)=-2sin(xu/2)(sin(xu/2)+cos(xu/2)),´úÈëԭʽ±ãÓÐ|(e^{-ixu}-1)/u|=|-2sin(xu/2)/u|<=2|xu/2|/|u|=|x|.
2Â¥2012-03-08 10:45:04
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