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[" 19.Given "f'(1)=1" and "(d)/(dx)(f(2x...

[" 19.Given "f'(1)=1" and "(d)/(dx)(f(2x))=f'(x)AA x>0." If "f'(x)" is differentiable then there exists a number "],[c in(2,4)" such that "f''(c)" equals "],[[" (A) "-1/4," (B) "-1/8," (C) "1/4," (D) "1/8]]

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