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  3. please prove that f is differentiable first...

Question: please prove that f is differentiable first...

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9. Let f be continuous on [0, oo), with f(x) > 0 for all x > 0. If f(x) = 21 f for all x > 0, show that f(x) for all x 0.

PLEASE PROVE THAT f IS DIFFERENTIABLE FIRST

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