[Solved]This integral of k dt needed to get this mark-M1? 1. The problem statement, all variables and given/known data Hi.The material,the question and the marking scheme respectively for my pure maths paper 3 question x1 only is shown below,it's an A2-level Oct 2002 paper if u know what that is. Is the integral circled in red needed to integrate?I find I don't need it.Am I wrong,if so why? 2. Relevant equations Simple integration rules only. 3. The attempt at a solution I did attempt by doing : Integral of dt/da = integral of (.1 a^-1 + .1(10-a)^-1) = .1 ln(a/(10-a)) Ps- there, I did it without the integral circled in red.