540 BELL SYSTEM TECHNICAL JOURNAL 



By simple transformations (286) becomes 



1 r" 



-^ oiFcFs cos {dc — Qs)di>: 



^ Xs + — sin ( 2X I sdt \ 



as r ^ 00 , (296) 



since by hypothesis s = 0. 

 We note for reference that 



-^r PcFs sin {do - eM^ = 2T f ^^" ( ^^ f ^^^ ) '^^' ^^^^^ 



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