Suppose f: RvecR^+ be a differentiable f...

Suppose `f: RvecR^+` be a differentiable function such that `3f(x+y)=f(x)f(y)AAx ,y in R` with `f(1)=6.` Then the value of `f(2)` is `6` b. `9` c. `12` d. `15`

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