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I would kindly like to ask you, if you can provide me some steps how to get this done.

Find and plot set $M =\{z \in \mathbb C:0<\arg\frac{z-i}{z+i} < \frac{\pi}{4}\}$

Thank you for your responses. (Not for sure if it is typed good because I don't know the terminology in English)

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    You've tried letting $z=x+iy$ and then trying to simplify from that?2012-01-08
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    I would like to see the steps how to solve it. I am not so good at complex analysis...2012-01-08

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