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Let f(x y)=f(x)f(y)AAx , y in R and f...

Let `f(x y)=f(x)f(y)AAx , 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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