-^.1 ) 14-^ ( ^?l<- 



cot. p := ^-i^f-^ 

 Imprimis autem notentur ifti valores: 



c fin. ^ —ffm. ^ et 4- cof. [3 —* a -4-/cor. <^ ,''; 

 quorum ratio ex fig«ra facillime patet, iiincque erit 



z c c rui. (3 cof. p — c- c fin. 2 (3 — a/lin. <^ 



4~ 2//fin.^cof. ^n.^/fin.^-f-/«fin. tt ^ , 

 deinde 



<: ^ cof. ^^ ~ c c fin. P' =: <: ^ cof. 2 (3 



rr ^ « flr-f- afcof. ^ -4-//cof. 2 (^. 



Subftituantur igitur ifti valorcs in noilra formula pro 

 tang. 2 Cp inuenta, ac prodibit numerator: 



a c fin. <^ — cc fm. 2.|3 — —fffxw. z ^ 

 et denominator: 



flfl! — a<;caf.|3-|-£:^cof, 2(^ — laa~\-ffcof,2^j 

 licque erit 



la a-\~ffcof. 2 4 



Nunc etiam pofitionem axis IM ad redam AF referamus, 

 ponendo angulnm AIM— 4^, vt fit >4^— i8o°— <$> — ^, 

 ideoque 2 vp ~ .3<5o° — 2 ^ — 2 <$) , vnde fit 



tang. 2 vl.r:-tang.(2^-^2Cp) = 7iSf:f^?Sf^''- 

 Quod fi iam hic loco tang. 2 cp valor modo inuentus fub* 

 ftituatur, reperietur 



. ___ — ^ g g tang. 2 i^ ^ 



tang. 2 \^^ — I ^^ ^ jj col. 2 (^ +// lin. 2 ^ tang. 2 ^ ' 



cft vero 



//(cof. ft ^ 4- fin. 2 .? tang. 2 ^) r= ^^, 



Tndft 



