Complex Exponential
1. **Problem:** Solve the equation in $\mathbb{C}$:
$$e^z = 3\sqrt{3} - 3i.$$
2. **Formula and rules:**
Recall that for any complex number $z = x + iy$, we have:
$$e^z = e^{x+iy} = e^x (\cos y + i \sin y).$$
To solve $e^z = w$ for $w \in \mathbb{C}$, write $w$ in polar form:
$$w = r (\cos \theta + i \sin \theta) = r e^{i \theta},$$
where $r = |w|$ and $\theta = \arg(w)$.
Then the solutions are:
$$z = \ln r + i (\theta + 2k\pi), \quad k \in \mathbb{Z}.$$
3. **Intermediate work:**
Calculate $r$:
$$r = |3\sqrt{3} - 3i| = \sqrt{(3\sqrt{3})^2 + (-3)^2} = \sqrt{27 + 9} = \sqrt{36} = 6.$$
Calculate $\theta$:
$$\theta = \arg(3\sqrt{3} - 3i) = \arctan\left(\frac{-3}{3\sqrt{3}}\right) = \arctan\left(-\frac{1}{\sqrt{3}}\right) = -\frac{\pi}{6}.$$
4. **Solution:**
Thus,
$$z = \ln 6 + i \left(-\frac{\pi}{6} + 2k\pi\right), \quad k \in \mathbb{Z}.$$
This is the complete set of solutions.
**Final answer:**
$$\boxed{z = \ln 6 + i \left(-\frac{\pi}{6} + 2k\pi\right), \quad k \in \mathbb{Z}}.$$