[ 282 ] 
l—tt )lt ( 2 t-\- 2 t z + 2/S, &C* 
it — 2/ 3 
-r 2/ 3 
4" 2/ 3 — 2/S 
-f- 2/ s 
And by performing the neceflary multiplications, 
or divisions, it will alio appear, that 
3 
2/ U 8/ 3 -f 24/ 5 + 48/7 4- 8 o/ 9 , ^ 
1—//' 
32/* 4* i< 5 o/ 7 4* 480/ 9 , &c * 
128/74- 896/*, &Y, 
yi2/ 9 , £?c. 
Now if we aflume, for the value of a, the follow- 
ing feries, t 4 - */ 3 4 ~ )' tS + + ut *> &c- 
Then it 4- ixt 3 4- 2?/ 5 + 22 / 7 4 - 2a/ 9 , &c.= ia« 
And becaufe is the tangent of the arc, whofe 
length is ia, therefore 
3 
it 
j—tt 
4-*x 
it 
1—// 
-hr* 
2 1 
1—// 
4-2X 
It 
I — // 
&C.: 
-ia. 
Which exprelfion is equivalent to the fum of the 
ollowing ferks j for 
it 
