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# C4 In/logs clarification (really quick)! watch

1. Hey, got the big C4 exam tommorow which went terrible in June, and just wanted some clarification on when integrating to ln.
Lets say we need to integrate 1/x-1 to keep it simple.
So the integral is ln (x-1) right?
What im getting confused with is it a bracket () or a mod sign. In the formula book it is a modules, then in the mark schemes it is a bracket?
I know that a modules is magnitude and hence it doesnt usually matter, but just wanted to know which should be put done in the exam?
Sorry if seems obvious but dont want to drop simple marks
2. |modulus|
3. Were you correcting my spelling or saying thats what i should always put? Lol
4. modulus! think of it this way, you cannot ln a negative number!
5. no, you should use the modulus sign
6. That makes sense, but why does the mark scheme then have a bracket?
If you are given two values to put in, then does it change?
7. You can just use brackets, if you specify |x| > 1.
Oh, and don't forget your "+ C"!
8. Will do, just use a modules as its easier and doesnt make any hassle remembering to state things. Hope i dont forget +C lol

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