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2065438+2007 Postgraduate Mathematics-Question 18! Proof of differential mean value theorem! How did the question mark come from?
X tends to 0 f(x), and the limit of x is less than zero. Because it is less than zero, its limit must exist. Since f(0) exists, it must be in the same order as 0, that is, it is 0.

Besides, thank you. At first, I read other versions of the answer, using Lagrange. I'm a little confused. After reading your answer, I understand. Thank you.