Integration by substitution : Edexcel Core Maths C4 January 2012 Q6(c) : ExamSolutions

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hello, the dx/du part confuses me.. why is it sometimes multiplied as du/dx then in some cases flipped to dx/du like you did in this example.
how do i know when i need to flip my differentiated value?

EUU
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Hi, I am having touble with a fairly basic concept which is causing me to lose marks in these type of questions. So, when you have for example, (u-1/u) I am not sure how to recognise when you can say that it is the same as u/u -1/u. I hope this makes sense and if you could explain, I'd be grateful. Is it simply when there is just one term in the denominatior? Cheers.

lukefiler
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why do you change the identities in some questions, like when do i know when to change them?

muhammadahad
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umh sir do you have any tutorials on proof by contradiction?

mbisetakobana