— 48 — 

 also auch 



(75a) 12(i4_|_b4) + 2-'(2i+b*) "^ 3-(^^ + b*) "^ 



_ _1_ 7t smli(7rbl/2) + sm(/rb]/2) 



~ ~2b^ 2j/2b3 cosli(.fbl/2) — cos(7rbl/2 ) ' 



b2 b2 b2 



(75b) P(14_|_b^) + 2^(2^+b^) "^ 32(3*+b-^) "^ • ' ' * 



7r2 __!^_ sin h (7rbl/^2^) — sin (/rb 1/2 ) 

 '~6b^~'~ 2|/2b3 cos(^bj/2) — cosh(/rbK2) ' 



€. Subtrahiert man endlich von der Relation (71a) die 

 Gleichung 



12 22 "^32 42 + "~ 12' 



so findet man : 



^ L___, __i .. 



I2(l2-fb2) 22(22 J-b2) ^ 32(3-' -fb-j • ' 



9h4 "1" s) 



~ 12b2 2b^^ 2b3 sinh(7Fb)' 

 fei-ner 



1 1.1 



»:i\ + t>-/t^2 



12(12- b2) 22(22 -b2) ' 32(32 — b2) 



7r2 1 7t 1 



12b2 2b4 2bn sinh(>fbi)' 



demnach 



12 92 '^2 



^ - P(lH^ " 2^(2^ + b^) + 32(3^+b^) ~ • • • • 



1_ _7t_ sinh(^l) cos (^) +cosh (0 sin (^|) 



~ 2b'^ b3 1/f cos (7rb]/2 ) — cos h (TthV 2 ) 



