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## Homework Statement

http://j.imagehost.org/0069/thermo.jpg [Broken]

## Homework Equations

## The Attempt at a Solution

OK, so I tried to derive θ in respect to r as in θ(r):

[tex]\frac{d\theta}{dr} = \frac{-100}{(r - 1)^2}[/tex]

Then, I multiplied both sides of the equation by 'dr',

[tex]d\theta = \frac{-100}{(r - 1)^2}dr[/tex]

Then I divided both sides of the equation by θ in order to find the fractional error but it doesn't match with the equation on the picture:

[tex]\frac{d\theta}{\theta} = \frac{dr}{(1 - r)}[/tex]

I'm lost.

Anyone?

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