ET COSINIBVS COMPOSITARVM. 3x 



- cft tcnendum , pro qua inuenimus 



f I I c of. n <p — cqf. {n -+. i ) (P 



onniflb enim poQremo membro vtpote a termino 

 vltimo pendente , (umma per meam definitionem 

 vtique erit ^ zr — 5 quod cum non tam facile pa- 

 teat, notandum e(t, hunc valorem natum eflfe cx for- 

 inula t rr ,('fl^c^.^j » quem valorem feriei propofi- 

 tae eflfe aequalem ita oftendi poteft : Multiplicetur 

 Ttrinque per 2—2 cof. fierique debebit 



f/K _52Cof.(I)-}-2cof.2Cl)-|-2cor3(I)+2cof.4Cl5 



' ^ ^" * "■ ^- 2C0f; Cp'- 2 C0(.(pC0(.2Cl)-2C0f.(pC0f.3(i) 



cum nuQC fit in genere 



2Cof.<zcof.^— cof.(di— i)+cof.(a-f ^) erit 



2 cof. (p' — 1 4 cof. 2 d) 2cof (l)cof.4.(^ncof.3(I)+cor5(P 



acof.^pcof 2(1)— cof.Cp-Hcof. sCp ^cof.CPcof. 5 (j)=:cof ^0i-co{.60 

 2Cof(I)cof.3(i)— co(:2(p-Hco(.^(I) 2cof(pcof.6(p-cof.5(p4-cof.7(p 



€tC. 



quibus valoribus fubftitutis aequalitas manifefto ia 

 oculos incurrit , prodibit enim 



cof. (p — I — 2 cof.(p-^ 2cor 2 (p-H 2 cof, 3 cp + 2 cof. 4 (p 



- 1 -cof. (p — cof 2(P — cof. 3 (p — cof 4(p etc. 

 - cof.^Cp- cof.3^ - cof^^^ 



§. 12. lisdem obferuatis cautelis ctiam pro ca- 

 fu X — 3 quo pofueramus 



j=fin.(P'+fin.2 0'-f-fin.3(P' + etc. in infinitum 



ct r:z:cof.(p'-fcof.2(P'+cof.3(P*+cof.4(P'+etc. in infinltum 



fum- 



