TITLE: Find a Function from a limit. Homework
QUESTION [1 upvotes]: I don't understand this question, #6. Could someone please explain?

Thanks

REPLY [2 votes]: Find similarity with the following one:
$$ \lim_{h\to 0} \frac{f(a+h)-f(a)}h =: f'(a) $$
The more general solution: calculate the left hand side limit, and write up any $f$ functions and any $a$ numbers, such that $f'(a)$ is the calculated number.
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