The function $y=\sin ^{-1}\left(e^{x}\right)$ is defined for all real numbers, but the range of the inverse sine function is $[-\frac{\pi}{2}, \frac{\pi}{2}]$. Therefore, the function is defined for all $x$ such that $e^{x} \in [-1,1]$. This means $x \in (-\infty,
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