solutions will help with my study. this does not count to my grade.
well i have been trying to work out part a of q3 and i got (1/2pi i k) (e^-ik - e^ik) but don't think i've been doing it right as it doesn't give me a value for cos r like in the question. and i need that to solve (b)
im clue less as how to solve 4 or 5.
once i see how there done ill be able to them. thats why id like solutions if possible.