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dividing by-cancels the-term in the

2N 2N

e e numerator, and then expanding gives

2N 2md 2N 2m d -1 2N 2m y = —e---— + ~— + —— (4.88)

2m which after addition and canceling terms finally gives y = 2Nd +

Equations 4.76 or 4.80 for Z(2,0) can then be solved by substituting this expression for y and similar methods of algebraic rearrangement.

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