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1. The problem statement, all variables and given/known data

Interpret the angle of the complex number [itex](z_{1} - z_{2}) / (z_{1} - z_{3})[/itex]

in the triangle formed by the points [itex]z_{1}, z_{2}, z_{3}[/itex].

2. Relevant equations

3. The attempt at a solution

I'm not entirely sure what to do in this question, I've done a couple of examples with some complex numbers but haven't noticed anything special about the resulting angle. I'm also a bit confused by what 'Interpret' means. Any help with this will be greatly appreciated.

thanks!

babak

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# Interpret the angle of the complex number

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