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lhw_heavy: ½ð±Ò+5, ¡ï¡ï¡ïºÜÓаïÖú 2014-04-23 14:09:13
lhw_heavy: ½ð±Ò+5, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸, лл 2014-10-13 11:10:39
(x-r)^2+(y-r)^2=R^2          [ r¡ÜR¡Üsqrt(2)*r]
V=Integral{¦Ð*y^2*dx£¬0£¬r}
   =Integral{¦Ð*{r+sqrt[R^2-(x-r)^2]}^2*dx£¬0£¬r-sqrt[R^2-r^2]}
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V=Integral{¦Ð*{r+R*Cos¦È]}*R*Cos¦È*d¦È,-ArcSin(r/R),-ArcSin{sqrt[1-(r/R)^2]}}
=¦Ð*R*Function{r^2*Sin¦È+R*r[¦È+Sin(2*¦È)/2]+R^2*[Sin¦È-(Sin¦È)^3/3],-ArcSin(r/R),-ArcSin{sqrt[1-(r/R)^2]}
=¦Ð*R*r^2*{r/R-sqrt[1-(r/R)^2]}+¦Ð*R^2*r*{ArcSin(r/R)-ArcSin{sqrt[1-(r/R)^2]}}+¦Ð*R^3*{{r/R-Sqrt[1-(r/R)^2]}+1/3*{(r/R)^3-{Sqrt[1-(r/R)^2]}^3}}
2Â¥2014-04-22 18:28:13
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