Answer
$- e^{-x}+\dfrac{4^x}{\ln 4} +C$
Work Step by Step
Given: $\int (e^{-x} +4^x) dx$
Thus, $\int (e^{-x} +4^x) dx=(-1) e^{-x}+\dfrac{4^x}{\ln 4} +C=- e^{-x}+\dfrac{4^x}{\ln 4} +C$
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