Calculus 2, Session 9 -- Integration practice

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I am a little bit confused when I have to integrate something that has a result involving ln. By integrating 3/(x+3), what is the difference between ln|x+3| and ln(x+3)? In the video, I see that because the lower limit of 0 results in a negative hence ln absolute values are used. However, are there any more cases?

amornchotsingh