2/2.M=:^Z^-l-iAtang. t, 

 hincque pro t reftituto valore t = ^^^jj~^> erit 

 ■ 2/2.M_4^ppr^— p-jT^p^j^-sAtang. ___, 



confequenter valor integralis quaefitus erit 



^ ■— 4 ^ 5 1/2-1/1I-HS4) ^ 2 A 1^^"§- -77F~ 



— i^^S -H Atang.^. 

 J. i^. Eft vero 



eodem modo: 



YlS /2 - -/(H-^^)] = YsV'2-^li--ss)V-:^ _ys_V2-ii-ss)V-t^ 



hincque ergo prior logarithmus; 



1 ^ y -|/ 2 -+-■/(! -f- ^4) 



4 s 1/2 — •/(!-+- S4) ' 



transmutatur in hanc formam: 



- i l T^C^T^2-f-(^ — s s)V— i]-+-V [sV2 (I — s s] V 1] 



2 |/[j-/2-f-(i — ss)V — 1] — VisV2—[i — ss)V — i]* 



quae forma porro reducitur ad hanc: 



1 7 s -/2-4- -/(r -f-s4 ) 



2 ^ (i_ss)-/_i ^ 



vbi imaginarium in denominatore non turbat, quoniam ad- 

 dita conftante l -/ — i toUitur, ita vt habeamus iftam 

 partem logarithmicam : 



I 7 s i/ 2 -H y ( I -h s4 ) 1 7 1 -+-S — 1 7 s y2-f-t/(i -f-s4^ 



S^ i — SS ^''l—f S*' H-f-5)2 



§. 17. Pari modo etiam ambos arcus circulares in 

 ynum contrahere licebit, hoc modo: Ponatur 



A tang. 2^11^^ — A tang. ^-^, eritque 



lA 



