Calculate, simplify and expand exponents with complex numbers

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Can we somehow calculate $a^z$ where z is a complex number ?

Does normal exponent rules like :

$$a^b\cdot a^c=a^{b+c}$$

Still work when complex numbers are in the exponent ? For example, do these egalities are true ?

$$2^{4+2i}+2^{3+4i} = 2^{7+6i}$$ $$(2^{4+2i})^{3+4i}=4^{(4+2i)\:\cdot \:(3+4i)}$$

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in that case using $\omega$ seems useful which implies $e^{\frac{2\pi i}{k}}$ for specific $k \in \mathbb {R^+}$ and $i$ is of course imaginary numbers

and as this implies angular coordinates on complex numbers then over I think