Edited by Valentin Fadeev, Friday, 24 Sept 2010, 13:25
Discussing one excercise on the forum recently we disagreed on the point, whether turning to complex numbers makes the solution more or less straightforward.
Here I'm digging out an example showing that this tescnique is not always as obscure as it sounds. And yes, this is another example of inappropriate use of fine methods against a basic school problem:
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