Is the Transition Map Smooth in the Intersecting Set?

sk1001
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Smooth transition map (easy!?)

Homework Statement


Check the transition map
http://img132.imageshack.us/img132/4341/18142532.png
is smooth in the set for which their images intersect

The Attempt at a Solution


I have thought of two ways to show this.

(1) Show that Φ is a composition of two smooth functions and is therefore smooth.
(2) compute the composite function and then prove that is smooth

Which way do you suggest?
I have attempted method (1) to some extent, but wondering if method (2) is easier.
 
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bump please
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...

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