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Let f(x+y) = f(x).f(y), forall, x, y. Su...

Let f(x+y) = f(x).f(y), `forall, x, y`. Suppose f(5) =2, `f^(')(0) = 3` then `f^(')(5) =`

A

6

B

3

C

5

D

none of these

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