= (31) == 



a« (cof. (J) — cof. -L) (cof. (p — cof. ^/) (eof. (|) — cof. '^^) x 

 H (cof. (p - cof. ^) . . . . (cof. — cof. 'iiLi-ili> 



3r 



§. p. Ciim igitur fit cof. « (J) = K'^" + «~")^ fi hoc 

 produdum fubftituamus, cofinus anguli «CP fcqucnti modo per 

 producflum ex k facfloribus compofitum cxprimetur: '* '"''^^ 



cof. fi(p=: 2'»-' (cof. (J) — cof. l) (cof. (|) — cof. H) x 



K (cof.(p - cof. ^o V .^- • (cof (p-cof '^'y;^| j., 



vnde fequentes deducimus refohitiones fpeciales, dum loco // 

 ordinc numeros i, 2, 3, 4, etc. affumimus; 



cof. I (p — cof (|)— cof. ^ — cof (p. 



COf. 2(J)= 2(cof.(J)— Cof.sf) (C0f.(J) — COf i^). 



cof.30= 4.(cof (p— cof^f) (cof.(J)— o) (cof Cj)— cofl^^). 



cof 4(J):= 8(cof (p — cof.^f) (cof (J)— cof.i^) (cof.(}) — cof.l^?) k 

 X (cof CP — cof ^f). 



cof. 5(J)— i6(cof.(J)— cof.?^) (cof (J)— cof ?f) (cof.(J) — c)x 

 X (cof.(p — cof.^f) (cof.(p — cof.lf) 



cof.6(J)— 3 2(cof.(J)— cofff) (cof (J) — cof if) (cof (J)— cof |^) X 

 X (cof.(J)— cof.gf) (cof.(J) — cof if) (cof.(J)— cof.V?). 

 etc. etc. 



§. 10. Qnodfi omnes iftos f-KRores attentius confide- 

 remus, repericmus binos fidores ab extremis aeque dirtantes 

 commode in vnum contrahi pofle. Cum enim duorum angu- 

 lorum , quorum fumma eil 180°— 2^, cofinus fint aequales, 

 fcd contrario figno affcdi, ob angulum t^^--'? — >. g — i. , 



eius cofinus erit zr — cof.-^, ideoque vltimu^ flidor z:= coi.(J) 



cof. 



