Answer
$$ y'= \frac{e^x}{\sqrt{1-(e^x)^2}} .$$
Work Step by Step
Since $ y=arcsin (e^x)=\sin^{-1}e^x $, then the derivative $ y'$ is given by
$$ y'= \frac{1}{\sqrt{1-(e^x)^2}} (e^x)'= \frac{e^x}{\sqrt{1-(e^x)^2}} .$$
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