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## Homework Statement

I need help with an integral, since my calculus skills aren't the greatest. I need help with getting from this

[tex]\pi[/tex]k[tex]\sigma[/tex]y[tex]\int[/tex] [tex]\frac{2x dx}{(x^{2} + y ^{2})^{3/2}}[/tex] (i)

to this

[tex]\pi[/tex]k[tex]\sigma[/tex]y[tex]\frac{-2}{(x^{2} + y ^{2})^{1/2}}[/tex] (ii)

I integrate from 0 to a (didn't know how to get the limits into TeX in (i) and the gargantuan brackets going on either side in (ii).

## Homework Equations

## The Attempt at a Solution

Am I supposed to do a substitution here or? In my physics textbook I saw the numerator of (i) written as d(x^2) and the denumerator unchanged as the following step. Now, I believe I have two functions here that i need to integrate 2x and 1/(x^2+y^2)^3/2.