\( f(x+y)=f(x) f(y) \) for all \( x, y \in R \). If \( f^{\prime}(0)=2 \) \[ f(4)=4 \text {, the...

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\( f(x+y)=f(x) f(y) \) for all \( x, y \in R \). If \( f^{\prime}(0)=2 \)
\[
f(4)=4 \text {, then } f^{\prime}(4)
\]
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