m****n 发帖数: 51 | 1 Integrate[f[r1] Integrate[g[r2]/Sqrt[r1+r2],{r2,0,Infinity}],{r1, 0,Infinity}]
f[0], g[0]!=0
In this integration, how can I treat the sigurity induced by 1/Sqrt[r1+r2]?
Also, how to calculate r1*r2/Sqrt[r1^2+r2^2] when both r1 and r2 approach to
0? |
|