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feixiaolin: ½ð±Ò+1 2015-08-27 19:18:16
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10Â¥: Originally posted by peterflyer at 2015-08-25 13:34:23
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V=y*(Lny)^2-Integral{y*2*Lny*1/y*dy}
  =y*(Lny)^2-2*y*Lny+2*Integral{y*1/y*dy}
=y*(Lny)^2-2*y*Lny+2*y+C

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11Â¥2015-08-25 13:37:33
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