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[" 29.A function "f" from "R" to "R" sat...

[" 29.A function "f" from "R" to "R" satisfies the equation "f(x+y)=f(x)*f(y)quad AA x,y in R,f(x)!=0],[" Suppose that the function is differentiable at "x=0" and "f'(0)=2" then prove that "f'(x)=2f(x)]

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