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Homework Statement
[tex] \int_0^R \! \frac{2rdr}{(r^2+x^2)^{\frac{3}{2}}} [/tex]
[tex] \int_0^R \! (r^2+x^2)^{-\frac{3}{2}}}d(r^2) [/tex]
Homework Equations
The Attempt at a Solution
how did you get from line 1 to 2