Wasn't it Arie L. Stavchansky who wrote:
>Hi Mike,
>
>I have been looking at your equations and am confused on equation number
>
>5.      x = (r1 + (R - x)/(R * r1)) * sin(atan(x/p(x))
>
>How can you define x with x in the right side of the equation?

That's the problem. That's what you get if you reduce the simultaneous
equations. I can't do any better it without knowing p(x).

Does it help if I rearrange it like this?

5a.      x - (r1 + (R - x)/(R * r1)) * sin(atan(x/p(x)) = 0

Even if someone tells me what p(x) is, it's still going to be horrible
to solve for x. I'd be inclined to use some sort of numerical method to
obtain an approximation.

-- 
Mike Williams
Gentleman of Leisure

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