C {i-\- cof. Cp} -<:'(! + cof. Cp% 



nec non 



hincquc 



VV __corj0' 

 y^'"~ cof. ^'(j) ' 



cof. -: - cof. ^ d)' y f' - Vc 



. ~— i- n: — ; , iiiie 



cof. ^ cp + cof. ; Cp yc'-\-Vc 



tang. -: (Cp' - Cp) tang. ^ (Cp' + 4^) z^ ^^/^ , 

 ideoqiie fi ftatuatur V^^, — cof. X fiet 



tang. ■ (Cp'-Cp} tang. 1 ((p'4-Cp) - L^-g^^ = tang. I X', 



proinde 



tang. ^ ((p' + Cp) = cot. : ($' - Cp) tang. ^ X' 



je!a Acad. Imp. Sc. Tom. IV. T.l A a a D E- 



