— 193 — 
Soit 
§. 5 . 
F{a, h) r= a h* 
.\+r+t wx/ nx* ^ ^mr-^ns^ 
on a P =z 2' ' (^«*-7) P® t) — T“) 
,+- 4 ., , mxf WX/ _, ,mr-4-fw, 
e = 2 + + (Cos — ) (Cos -) Sin (-7-) s:, 
et 
( 1 — P Cos tx)Q~{’p Siatx P 
= 2'+'+'(Cos (Cos:^) [Sinc^i^jx+P Sm((- 
nx* mr + ns 
mr -f- ns 
P Sinix Q -{- (1— P Cos/x) ^üF(a-^ayb-\-ß)—P'} .—m2 (1 pCostx) 
+ 2'+'+'(Cosî^f(Cos^)’[pCos(<- 
Des formules {.^) et (B) on aura 
r„r„w,_ ^“w_Cos/^î±^);.l. 
2/1 a^*-' ’ \o/J 
52 
/ 
CO 
MiAT nx * nir-4-ns mr-4-ns, , 
(Cos-) (Cos-) [Sm(-^)x+pSm(t 
n 
2 ( 1 — 'Pe ), 
1 — a P Cos <x -f" P* 
, -»Â , , -nh 
_ ï_ 
-th. \ n / ‘ 52 ' „'+»■+' 
•(») 
30 
