[ 28l ] 
Therefore the logarithm of—— will confiftof the 
I — — H 
lums of the powers of that feries, multiplied by the 
above-found coefficients b — b+i’— 4>+7> 
if -f in* 4.72 s , &c. 
n l 372* -j- 6 n s , &c. 
11 *- {- 4,72 s , &c. 
72 s , 
n+ n* 4- 723 _J_ 72+ -y n s y fcfr. 
~ 7« 2 — J-»3 — ?»+— 4„s, £? f . 
-H* 3 +j* 4 + 7 * s » fcfr. 
— 4 72 + — 
-f 7« 5 , &V. 
The fums of which, v/js. 4-472+4-} 72$, &cl 
will be the logarithm of — — , as above affirmed. 
I — 72 
The operation neceflary, to find the coefficients of a 
feries, which will exprefs the length of the arc of 
a circle, by the tangent of that arc, and its 
powers. 
Let a reprefent the length of the arc, and t the 
length of the tangent thereof 3 then the tangent of 
that arc whofe length is 227, will be — which 
1 — tt 
fraction is equal to the infinite feries, it 4- 2/ 3 -j- 2 / s 4 ~ 
2t 7 2 t 9 } See the divifion. . 
N n 
c —tt 
