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[5.11C):" A function "f(s)^(c)R" satisfi...

[5.11C):" A function "f_(s)^(c)R" satisfics the equation "f(x+y)=f(x)." f(y) for "],[" all "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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