Let f(x y)=f(x)f(y)AAx , y in Ra n df i...

Let `f(x y)=f(x)f(y)AAx , y in Ra n df` is differentiable at `x=1` such that `f^(prime)(1)=1.` Also, `f(1)!=0,f(2)=3.` Then find `f^(prime)(2)dot`

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