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Let f:R to R satisfy f(x+y) =2^(x) f(y) ...

Let `f:R to R` satisfy `f(x+y) =2^(x) f(y) +4^(y)f(x) , AA x , y in R `. If f(2) = 3 , then 14. `(f'(4))/(f'(2))` is equal to ______.

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