Ngô Quốc Anh

May 1, 2008

Two times derivable real function

Filed under: Giải Tích 1 — Ngô Quốc Anh @ 16:41

Two times derivable real function
RMO 2008, 11th Grade, Problem 3


Let be a function, two times derivable on for which there exist such that\frac { f(b)-f(a) }{b-a} \neq f'(c) , for all . Prove that .

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