(adsbygoogle = window.adsbygoogle || []).push({}); e^(-i * x) not well-defined. Why??

Hi, Just saw this as a step in an example that demonstrates the differentiability of holomorphic function. But I can't for the life of me figure out why e^(-2iθ) is ill-defined.

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# E^(-i * x) not well-defined. Why?

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