Yesterday I answered a question in a somewhat unsatisfactory way. Today I worked out the kind of answer the questioner really wanted, but now I can't find the question. Question was: g(x) = [f(x)-f(a)]/(x-a) x ≠ a; g(a) = f'(a). Find g'(a). Turns out to be f''(a)/2. The questioner used L'Hospital's rule and asked if it could be done directly. I now have the answer he/she was looking for but cannot find the question.

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    $\begingroup$ Your user profile has an "Answers" section with links to all the answers you have ever given. $\endgroup$ Aug 25 '13 at 1:48
  • $\begingroup$ I looked there but couldn't find it. $\endgroup$
    – Betty Mock
    Aug 25 '13 at 15:25

Maybe you looked at your meta profile. Here are your answer:



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