If f(x1 + x2 + ... + xn) = f(x1)f(x2)...f(xn) for all x belongs to real; and f(0) = 2 and  f(m) > 0 where m,n belong to natural and m is even and n is odd. 

Evaluate lim ((f(x)-1)/x) where x tends to zero.

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Can you kindly give me the solution for the problem?

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