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Integrate[ Sqrt[1-y/a], {y, 0, a} ]=2a/3
ÇúÃæ=2*pi*r*2(nr)/3=4*pi*n*r^2/3

[ Last edited by feixiaolin on 2013-11-29 at 15:00 ]
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3Â¥: Originally posted by peterflyer at 2013-11-29 13:35:31
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S=Integral{dL*2*¦Ð*x,0,r}
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  =¦Ð*/*r^2

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