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1. integrate

I already replaced what was inside with u and am now integrating it with respect to du.

I thought you would usually move the bracket to the numerator and take out what is in the brackets, but because ive already done that, how do I integrate it and why dont I repeat the step of taking out what is in the brackets?
2. (Original post by Maths&physics)
integrate

I already replaced what was inside with u and am now integrating it with respect to du.

I thought would usually move the bracket to the numerator and take out what is in the brackets, but because ive already done that, how do I integrate it and why dont I repeat the step of taking out what is in the brackets?
Note this expression is just (u+1)^(-2) which you should just know how to integrate
3. I hate this part of C4, it's a pain. I don't get the whole Ln part of substitution
4. (Original post by B_9710)
Note this expression is just (u+1)^(-2) which you should just know how to integrate
yes, thats what I said (id move the bracket to the numerator). however, at that point id take out from inside the brackets and differentiate it. but ive already done that - hence why its a u inside.
5. (Original post by Maths&physics)
yes, thats what I said (id move the bracket to the numerator). however, at that point id take out from inside the brackets and differentiate it. but ive already done that - hence why its a u inside.
Why are you differentiating though, what's your logic for doing that?
6. (Original post by B_9710)
Why are you differentiating though, what's your logic for doing that?
you usually take out whats inside the bracket
7. (Original post by Maths&physics)
you usually take out whats inside the bracket
I'm not sure I understand what you mean
8. (Original post by B_9710)
I'm not sure I understand what you mean
its ok, I did it my way and I got it right.
9. (Original post by Maths&physics)
you usually take out whats inside the bracket
I don't think that warrants as an answer to his question whatsoever, but OK. I *think* what you're referring to is integration by substitution, whereby here you would 'take out' and differentiate it to get . Needless step TBH, but you end up with

Would help if you construct your questions clearly and coherently.
10. (Original post by RDKGames)
I don't think that warrants as an answer to his question whatsoever, but OK. I *think* what you're referring to is integration by substitution, whereby here you would 'take out' and differentiate it to get . Needless step TBH, but you end up with

Would help if you construct your questions clearly and coherently.
thats exactly would I would do (substitution). thanks

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