So i'm doing a question from one of my past exams as attached, there are no copy right issues with this document that I know of and have asked my lecturer who wrote the exam and he said I am welcome to upload it. The question is 1)b)iv), my attempt is attached. I end up with a 2l+1 where there should just be 1, can anybody tell me where I went wrong?
Relevant equations are attached in the past exam
The Attempt at a Solution
My scan is too large to attach so please use the url provided. Thanks