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|x(t)-x(\tau)|=\sqrt{[x_1(t)-x_1(\tau)]^2+[x_2(t)-x_2(\tau)]^2}
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2Â¥2013-09-27 09:55:52
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3Â¥2013-09-27 11:06:24
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tianshui1001: ½ð±Ò+1, ¡ïÓаïÖú, ºÇºÇ¾ÍÊÇÎÞÇîÁË 2013-09-27 22:53:12
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2Â¥: Originally posted by tianshui1001 at 2013-09-27 09:55:52
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\lim\limits_{\tau\to t }\frac{\cdot x'(t)}{|x(t)-x(\tau)|^2}
ÆäÖÐx(t)=(x_1(t),x_2(t)),\quad x'(t)=(x'_1(t),x'_2(t))
|x(t)-x(\tau)|=\sqrt{^2+^2}...

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4Â¥2013-09-27 11:10:49
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