So I tried to do the question shown in the first image (I only have a problem with part b). I got the same working out as what was shown in the answer book. The problem is that I don't see how some of the terms cancel (see 2nd image).
So I tried to do the question shown in the first image (I only have a problem with part b). I got the same working out as what was shown in the answer book. The problem is that I don't see how some of the terms cancel (see 2nd image). View attachment 10669View attachment 10670
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