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## Homework Statement

I'm stuck at an attempt to solve an integration step. I think I'm supposed to trig substitute?

## Homework Equations

http://img685.imageshack.us/img685/9158/unavngivetn.png [Broken]

It is the second to third equation I'm having a hard time with

## The Attempt at a Solution

From second equation: (I'm only doing the integral)

[tex] \int_0^{\pi} \frac{Sin \theta}{[R^2 + Z^2 - 2 R Z Cos \theta]^{1/2}} d \theta[/tex]

[tex] u = cos \theta[/tex]

[tex] -du = sin \theta[/tex]

[tex] \int_{-1}^1 \frac{1}{[R^2 + Z^2 - 2 R Z u]^{1/2}} d u [/tex]

I flipped the boundaries to remove the minus sign.

And here I'm stuck. I could use some help :b

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