Expanding Equation 40 gives: Substituting Equation 43 into Equation 42 and making use of the definition of Sn(a) in Equation 6 yields: Expressions for Si (a) and S4(a) can be obtained by using Equation 27 with appropriate values of n. Therefore, to find Sg00d(a), it is necessary to find Q(a). This can be done by rewriting Equation 43 as follows: This ran he intparnfpd hv nartc qc fnllnwc*
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