ET COSINIBVS COMPOSITARVM. 35 

 fiinilique modo fi (latuatiir 



X cof . ^ — x' - 



ex eaqiie valor litterae x eruatur ;, etlam erit 

 a~xcoL(p-i'x\oi:.2(p-\-x\o[:.:i<p+ 



Exempl. 2. 



Sit nunc 



A : iS z= 2 4- i «* + 5 2:'-4- ^ 2;* + in infinit. 



^ log, _i— ; ita , vt feries propofitae iam fint 



S — xCin.(P+lx"Cia. 2 (p-^'jx'Cm. 3 0+ 



et TznA-conCp-i-i/cor. aCp + iA^^coCaCp-l- 



liabebimus 



aSy-i:z:log. -^ — - log. —!— =. log. '-^=1« 

 fiue 



2 C t/ _ _ T_— yco/. qi -t- * V — I /»tt . 



— 1 — X co/. Cp — X V — 1 /m. Cp 



pro cuius formulae redudlione confideretur haec 

 forma 



log.-^-rtxy.— J 



^ / — g. V — I 



de qua conftat , li ponatur -S- rr tang. u, hunc lo- 



garithmum fore — 2 w. V — 1 j hinc ergo quaera- 

 tur angulus u, vt fit 



taug. (0 zr ''^'"• ^ : 



vnde protcnus fcquitur S =r 0} ; pro altera progres- 

 £one cum fit 



^T=:log.^+Iog.,-^,r-log.(i-2:rcor(I)+Ar') 



