(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I'm having a hard time differentiating when to use log instead of ln, vice versa. Are there any general rules to follow?

For example I have to evaluate 4u^-3 + u^-1.

2. Relevant equations

f'(1/u) = log u

f'(1/u) = ln u

3. The attempt at a solution

I put -2u^-2 + log(u) but the textbook solution shows the same answer except with ln.

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# Homework Help: Ln vs log, when to use?

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