 7
 0
Please find attached the problem im having difficulty with its part (b) i need help with.
Cheers,
Dave
Cheers,
Dave
Attachments

27 KB Views: 92
Ya its just that it it gets really messy and im not sure how to manipluate it properly do you, the eqn is what your supposed to get if you solve it with r =0 know any good sources on the internet for solving these things.What have you tried so far? I assume that you wrote out the equation in terms of the sum. What is that equation with r= 0?