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Sunt qui his finuum et cofinuum valoribus potius 
utuntur ; verum ii valores, quos exhibet corollarium 
prascedens, fimpliciores funt et calculo plerumque 
aptiores. 
Coroll, III. 
Quoniam eft 2 X cof. A = / 4- erit 
> + x/"’ 1 ' m + A X — + A 
2 K x cof. AY 
X - — * X - — - /"’ 3 m' -J-, &c. 
nt + \nt ri / + A x - — - m y ~' /* + A 
X ~~~ X — tn x ~ 3 5 1 3 &c. 
2 3 
aftumendo fcilicet primos et ultimos terminos homo- 
logos feriei exprimentis quantitatem / -]- ?m K : unde, 
propter Im 1, provenit 
2^ x col. A| = hAX J-AX 
o 1 O' 
* . X I X 
x r a x — r— x 
2 ' " 2 
atque adeo per lemma 
2 ' 2 
2 h~* + n x ~ 6 , e 
- x — h 
cof. Ah = —=i in cof. A A 4* A cof. A — 2 x A \ 
X - 1 cof. A - 4 x A -f A X - — - X cof. A- 6 
2 1 23 
X A 4-, &c. 
Ubi A eft numerus impar, terminus ultimus feriei 
erit ille in quo numerus A, vel A — 2, vel A — 4, 
£cc. qui multiplicat angulum A, evadit requalis 1. 
Ubi verb A eft numerus par, terminus ultimus feriei 
erit ille in quo numerus praxli&us evadit aqualis o, 
5 <l uo 
