43 6 PROPAGATION DE LA CHALEUR 



[ F<Pcos[2/ôcos(<p— fli.)]-t-y?sin[2/9cos(9~c(-)]-+-F(2ct,— (?) — o, 

 \ Fi?>sin[2/ôcos(<p— a.)]-;/?cos[2/ôcos((p— oc.)]_/w-(2ct— ?) = o, 

 F(pcos[2/9cos((p— ct.')]-H/^sin[2/9cos(<p— at-')]-t-F(2<t'— (p)zr o , 



f^^l \F<l,Sm[iBcOs{<P— CL.')]— fi>C0s[il^C0s{9— Ct')]-\-f{iOL,'—(p) zz 0, 



F(pcos[2/âcos(9— ct,")]-H/psin[2/ôcos(ip— (X,")]-»-F(2a."— p)= o, 

 F(psin[2 /ôcos(<îi— cc")]-;/?>cos[2 /âcos((p— <x,")]-»/(2 sc"— ?) = o , 



/ F( 2 (et— a.')-i-(p)=Fp cos 2 /9 [cos(ip— a')— cos(ip— et' -t-ct— et' )] 



-+-/^siii2/ô[cos(<p — ot') — cos(ip — a-'-i-ct — ex,')], 

 f(2(a^-oL')-4-(p)=: — Fiî>sin2/ô[cos(ip — et')— cos((î>— ct'-i-ct— a,')] 



-+-/(pcos2/9[cos((î> — et') — cos(ip — O-'-Hct — et')], 

 F(2(ot" — ct)-H(p)^F(pCOS2/9[cos(ip — et) — COs((p — ct-Hot" — et)] 



-H/^sin2/9[cos(ip — fit) — cos(ip — st-t-ct" — et)], 

 f(2(ot"— ot)-H(p)— — Fipsin2/9[cos((p— et)— cos(?i— ct-Hot"— et)] 



-h/^COS2/9[cOs(iP — et) — COs(ip— Ct-(-£t" — et)], 



F(2 (et' — et")-(-(p) = F9COS 2 /â [cos(ip — et") — COs((p — et"-+-ot' — ot")] 



-H/q)sill2 /9[cos(9— et") — COs(<p — et"-l-et' — et")] , 



f(2(ot'— ct")-t-<p)=:— Fipsill2/9[cos((î>— et")— COs(ip— ct"-f-ct'— et")] 



\ -t^COS2/9[cos((p — et") — COs(ip — et"-t-et' — et")]. 



f Ff?-*- — )=F?cosr2/9/Jsinfil'— jU-Hf^inp/ô/^sinU- -]1 

 =F<pcosr2/ô/3'sin(<P-+- H l-^/çsin 2/ô/Jsinf ?-»- ^ )1 

 :=F(pcos[2/9|/3'sin<p]— ;/?sin[2/6|/3"sin(p], 



[19] 



[20] 



f[<p-t-Y)=-Fiî'sin 2/9/3 sinU—^j U^cosj 2/9)/^sinL— ijl 

 — — F?sinr2/9/J'sinL-H ^ jJ->^cosr2/9/3"sin[(p-»-^ ]1 

 =F'Psiii[2/9j/3"sin9]-t^cos[2/9t/3'sin(f)]. 



à 



