- #1
transgalactic
- 1,395
- 0
[tex]
\int \frac{r^2dr}{\sqrt{r^2+x^2}}=\int{rdt}\\
[/tex]
[tex]
t=\sqrt{r^2+x^2}\\
[/tex]
[tex]
dt=\frac{2rdr}{2\sqrt{r^2+x^2}}
[/tex]
i tried to solve it like that
\int \frac{r^2dr}{\sqrt{r^2+x^2}}=\int{rdt}\\
[/tex]
[tex]
t=\sqrt{r^2+x^2}\\
[/tex]
[tex]
dt=\frac{2rdr}{2\sqrt{r^2+x^2}}
[/tex]
i tried to solve it like that