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Let f(x y)=f(x)f(y)\ AA\ x ,\ y in R an...

Let `f(x y)=f(x)f(y)\ AA\ x ,\ y in R` and `f` is differentiable at `x=1` such that `f^(prime)(1)=1` also `f(1)!=0` , `f(2)=3` , then find `f^(prime)(2)` .

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