I can't follow a vertain step in my book in complex analysis (Kwok):(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\frac{d \bar{z}}{dz} = lim _{\Delta z \rightarrow 0} \frac{\Delta \bar{z}}{\Delta z} = lim _{\Delta z \rightarrow 0} e^{-2i Arg \Delta z}[/tex]

I can't see how you could arrive at this last expression, could anyone give me a hint as how to do this?

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# Complex differentiation

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