1778. 1^^' Aug. Sept. 231 
hvaraf följer, dä termerne utveklas, 
0 = Si» A'- Sin B'^ Sin C* — Sif? R'^ CofB^ 
— Sin B'^ C of A' * C of C 2 — iSin B' ^ CofA'. CofB C of C 
— SinC^ Co/C'^ ~ SinC^ CofA'^ Ccf B'^ 
— t Sin CofA' CofB' C of c' — SinA'^ Cof A^ 
— SinA'^Cof B'- CgfC = —xSinA'- CojACofB' CofG 
— z C oj A CofB C of C — zCofA CofA' CofB CofB' 
— iCofACofA' CofC CofC— zCofB CofB' CojC CofC' 
— 2 Col B' 2 CofA' CofB CofC— 2 CofC ^CofA' CofB' Cofc' 
— 2 CofA' 2 CofA C oj B CofC' —2 CofA' ^ C of B' ^ CofC ^ . 
Om nu, tor mera redighet fkull, de termer 
tillena betraktas, uti hvilka enkla Cofinus före- 
komma, lå finnes latteligen at dc til följande 
uttryck kunna fimmandragas : 
— 2 CofA CofB' C ej C _ z CofA CofB Cofc' 
— t CofA' CofB CofC — 2 CofA' CofB' CofC 
— iCofA CofA' CofB CofB' —zCofACofA' CofC CofC^ 
— 2 CofB CofB' CofC CofC. Vidare emedan 
SinA'^ SinB'^ SinC^ — SinA'^ CofB'^ CofC^ — 
S!nA'^(\-CofB'^-CofC^ )och Sin B' ^ C o( A' ^ Cof C 
+ SinC^CojA'^CojB'^ + zCofA'^CofB'^ CofC^ =Z 
CofA'^ CojC- CofA'- CofB'^ — CofA'^ {CofB'^ 
CvfC^Ji altlä blifvcr SinA'^ Sin B'^ Sin C^ — 
SinA'^ CofB'^ C of C 2 — SinB'^ CofA'- CofC^ — 
SinC^CofA'^ CojB'^- — zCofA''- CpjB'^ Cofd 
Sin B' ^ CofB* — Sin C ^- C of C ^ — Sin A' ^ C of A^ = 
Sin A"' -r- CofB'^ — CofC^ — sin B'^ CofB^ — 
Sin C ^ CofC ^ _ Sin A' ^ CofA- ~ i — CofA^ 
CofB'- —GojC^ — CofA'^ — CofB'^ — CofC'^ 4- 
GojA^ GofA'^ + GofB^ CofB'^ + CofC^ CpfC'^. Folj- 
Q.4 ak- 
