Square root of 2 = 2

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With my YouTube-Video I will demonstrate that “2 = Square root of 2”. Where is the mistake? In spite of the fact that the text of this proof is written in German, you could understand it without knowledge of this language.

Thanks to Ortmar Buss (ojbuss) for this submission!

Source: http://www.youtube.com/watch?v=RWCbNHo3Tdo