== (48) 



Hinc diffcrcntiando crit 



3 tang. 30 — tang.Cj) -4- tang. (5o'-f-Cj)) — tang. (<Jo— (J)). 

 Exemplum. Sumatiir ~ 25% critque 



3 tang. 75° zz: tang. 25^ -+- tang. 85° — tang. 35% 



cuius vcritas cx fubicdo calculo vidcre licct : 



tang. 25° rr o, 4^^3077 

 tang. 8'> =11,4300520 



Sumnia r=: 1 1, 8963597 



tang. 3 5^^=^: 0,7002075 



3 tang. 75' = II, 1961524 ii,ii>6i522. 



Altiid excmphim. Sumamus (J) zr 29", eritquc 



3 tang. 87° = tang. 29° -f- tang. 89° — tang. 31° , 

 vcluti cx fubieiflo calculo vidcre licct 



tang. 8*7° =1 19, 08 II 37 



3 tang. &7° 



57j 24-3411 



tang. 29= — o, 554309 



tang. 89 = 57^ 289962 



Summa r^ 57, 844271 

 tang. 31"=: 0,600860 



dilfcrcnt. zz: 57, 243411. 



§. 37. Sumamus ctiam cxcmphim quo anguli occur- 

 runt maiorcs rccfto, fitqiic Cj)=z5 8', cfltquc oportct : 



3 tang. 174" = tang. 5 8° -h tang. 118'' — tang. 2',' 

 quac acquatio rcducitur ad fcqucntcm: 



3 tang. 6" =1 tang. 62" -f- tang. 2" — tang. 5 s', 

 ct calculus ita fc habcbit : 



tang. 



