The inner integral is:
\[
\int_{0}^{e^{x}} 4 \sqrt{1+e^{x}} \, dy
\]
Since \( 4 \sqrt{1+e^{x}} \) is constant with respect to \( y \), the integral becomes:
\[
4 \sqrt{1+e^{x}} \int_{0}^{e^{x}} \, dy = 4 \sqrt{1+e^{x}} \cdot [y]_{0}^{e^{x}}
\]
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