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I don't understand this question, #6. Could someone please explain?

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up vote 2 down vote accepted

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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