[" 16.Let "f:R rarr R" be twice continuo...

[" 16.Let "f:R rarr R" be twice continuously differentiable (or "f''" exists and is continuous) such "],[" that "f(0)=f(1)=f'(0)=0" .Then "],[[" (A) "f''(c)=0" for some "c in R," (B) there is no point for which "f''(x)=0],[" (C) at all points "f''(x)>0," (D) at all points "f''(x)<0]]

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