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Hi,The problem statement in post #1 is exactly as it was given to us, bar the typo I explained in post #7. I have emailed the lecturer to ask him if the final answer on the tutorial sheet is correct. If it is, I have asked him to explain how it is derived.
In the meantime, my sincere thanks to all those who have helped, @MrAl @Alec_t @crutschow
Maybe you could report back here what becomes of that?
Maybe we overlooked something.
