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Prove that http://img705.imageshack.us/img705/2408/aaa12.png [Broken] is irrational. A user on another forum suggested the following:

http://img130.imageshack.us/img130/1352/abcde.png [Broken]

I follow that up to the last sentence. Can anyone clarify for me how to show this proof?

http://img130.imageshack.us/img130/1352/abcde.png [Broken]

I follow that up to the last sentence. Can anyone clarify for me how to show this proof?

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