- Recall the definition of the matrix exponential: $e^A = \sum_{n=0}^\infty \frac{A^n}{n!}$.
- Consider the inverse of $e^A$: $\left(e^A\right)^{-1}$. By properties of exponentials and inverses, $\left(e^A\right)^{-1} = e^{-A}$.
- Now, consider
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