) o C A 
G « 
25Î 
angulus PEP fit y, adeoque angulus p rexiguus PEp 
= erit arcus Pg, centro E & radio EP feu r de- 
fcriptus, = rdy; unde ipfe SeQror PEg feu PEp = 
±r 2 dy. Sed PE :PF::SqQ:. PEp: Se£t. PFp, h. e., 
r: 2 — r.-.-i r*dyt PFp = fr. 2 — r. dy; ergo, in lo- 
cum ipfius r fuffe&o ejus velo /e ex $. 2., fit PFp 
1 — e 2 ( i -p e 2 -p ie Cof y) dy 
2 
habetur 
(1 -p e Cof y ) 2 
dt ; unde 
2 dt 
— = (1 -p e 2 + Cof, y) (i-p e Cof.j) 2 . dy 
— £i-p e 2 — 2e 5 Cof. y -p (— e 2 -p 3e 4 ) Cof. y % 
-p (2e 5 — 4 r*) Cof. y % -f- (• — 3e 4 -P 5<? 6 ) Cof y* 
-P Cof. — 5e 6 Cof. j 6 &c.] dy. 
Hujus expresfionis termini illi, qui intra Parenthe- 
fin magnam concluduntur, ope arcuum multiplo- 
rum figillatim fic explicantur: 
Ii % 
I + C 
