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## Homework Statement

∫dr/√((1/(R+r))-(1/R))

## Homework Equations

## The Attempt at a Solution

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- Thread starter armin.hodaie
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- #1

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∫dr/√((1/(R+r))-(1/R))

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- #2

gb7nash

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If it is, try to simplify the denominator before trying to take the integral.

- #3

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no,i type it wrong

∫dr/√((1/(R+r))-(1/R))

∫dr/√((1/(R+r))-(1/R))

- #4

Ray Vickson

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Homework Helper

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## Homework Statement

∫dr/√((1/(R+r))-(1/R))

## Homework Equations

## The Attempt at a Solution

So, is your integral

[tex] \int \frac{dr}{\sqrt{\frac{1}{R+r}-\frac{1}{R}}} ? [/tex]

If so, re-write it by first expressing

[tex] \frac{1}{R+r}-\frac{1}{R} [/tex]

as a simple rational expression. You should end up with an integrand of the form

[tex] \sqrt{\frac{ar+b}{cr+d}}. [/tex]

RGV

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