Posons donc ^'Ji = cPM;: t^Jl—cVM; ^'lz=zcV^-: 



e e e 



±-^^=zcV^: ^'±=:d^N: nous aurons 



A-^a— L fin. O [ - 3 fin. rt ^ec. 1? M- N + 6 cof. n fec. W tang. 6 M N^ 



— tang. h cof a M^^ -j- 2 fin n fec. 6* N^ -h ^fin.a fec.b^tang.b-N^ 

 3 cof. a fec. b- N rf M + 3 cof a fec. 6-Mr?N - 3 fin. a tg. b M rf M 

 6fin. a fec. b-tg. b Nd N h- tg. b cof. addM^ fin. a fec. 6" d c^, M] 

 L cof. O.d O [ cof a fec. 5- M N — 3 fin. a tang. b M^ 



-+- 6 fin. a fec. b-tg. b W" -+- 3 cof.a tg. 5 rf M -+- 3 fi" o fec. b-d N], 

 ~ 3 L fin. O d O- [cof a tang. b M -f- fin. a fec b- NJ 



— L cof O. d O^ fin. a tang. b — L fin. O. d O^ 



L'b — L fin. 0[fin. a M' ~ 3 cof a M ri M — fin. a d d M } 



— 3 Lcof. O.cZO [ cof. a M^ -j-fin.adM j -KaLfin.OriO^fin.aM 



— L cof O. d 03 cof a 



A^a ~ L fin. O [ - 4 cof a fec. 6^ M^ N — i 2 fin a fec. 6= tg. b M^ N^ 

 -+- i6cofa fec.b-tang b-MN^-f- 8 cof afec.b%lN'-|- tg.6fin.aM* 

 H-i6fin.nfec.b%bN^^^fin.afec.b^tg.b^N^ - i ^^fin.nfec.b-MNdM 



— 6 fin.n fec.b'^ M' d N -f- i:co( a fec.b-tang.b.N-rfM 



■4- 24 cof a fcc. b- tang.bMNc/N — 6 cof a tang b iM^ rf M 



;8fin.afec.b^N-rfN-f-i4fina(ec.b-tg.b-N-cZN.^6cofnfecbT/MdN 



.^. cof n fec. b-NfWM +- ^cof a fec. b~MddN ~ -^ fin.a tg. bMc/cLM 



S fin. a fcc. b- tang. b. N cZ c/ N — 3 fin. a tang. b. rf M- 



-+- 6 fi n . n fec . b- tg. b. rf M- -f- tg. b co f. a c^3 m -^ fi n . a fec. b^ cZ^ N J 



H- L cof O c/ O [ — I c fi n . a fec. b- M^^ N -f- r^ 4 cof a fec . b tg. b 1\'] N" 



— 4 cof a tg. b. M^ -+- s fin a [ecb'' N^ -+- 1 6 fin. a fec. b' tang b- N^ 

 -h I 2 cof n fec.b-Nc/M h i 2 cofn fec.b^Mc/N - i ^fin.n tg.bMc/M 

 H-.2 4fin.afec.b-tg.bNc/N -+- ^cof a. tg.bc/c/M-+-4fin.n fec.b-c/c/MJ 



~ L fin. Oc/O' [—6 fi n.n fg. b M- + 1 -2 fin. n fcc. b= fg. b N- 

 -+- i2cofn fec b-MN H-6cof.n tg.b. clM -l-c fin.a fec. b-^/NJ 



— 4 L cf.f O d O' [c:>f a lang; b. M H- fm: a fcc b" NJ 

 L fin. O ./ O^ fin a tang. b • - L cof O// O^ 



-I 



10 



