I know I lost at least 6 marks. I ****ed up the vectors and got C and D wrong, so that's 2 marks down + at least one of the method marks would probably require using the correct value for AB, lost 1 for the wrong k (I put 12 but it was 6), and probably at least one mark down for integrating with the wrong k. And one more mark down for including x=0 in the trig question.