QUADRATURE of the CONIC SECTIONS, &c. 298 
a ae I 
fec' a Be aie ns Boy hE ea 2 atest iva, 
tan? a a%*tantia 8 2 2 
fec’+a fec’ ia I Bitee oe a 
4 A Ea Saas CL RS = 3 tan —@ 1€ ’ 
2? tan’ +a 43 tan? +a 8 4 4 
fec*'+ 4 fec* +a I I Cag 
aE, = Ong nee 8) Tapes ie fec 3” 
4? tan’ 74 8 tanga 
2 
fec” eo fec aa is 
Tsoi qu | — —he tan 4. fect 4, 
23—") tans _* 23(m—1) tan} 8 
Qn—2 | 27—tI 
a 
fec* aro fecs— é is ia 
i n 
n 2 
27% tans = 
231) tins = 
2n—1 
Let the fums of the correfponding fides of thefe equations 
be now taken, and rejecting from both the common feries 
fec? 
fec* +4 us fec’+ a vi gn—t 
3 3 3 oe eaeer ae d 
23tan°*t@  23tan?+e@ / ate) ean 
gmk 
the refult will be 
4 Ir I I I I I 
[ * tan 2 a fec sate gamete feck be ] 
—< 3 c 
L J 
VoL. VI.—P. II. O (6) and 
