[ 373 ] 
i. e. bdAface — axed -|~ be ' r 1 • 
2 
^ bd-Vace — i 
9 - , = a . 
cd-\-be 
‘prop. 4. 
The fame things being fuppofed as in Prop. 3. ex- 
cept that bb y inftead of being equal to acc-\- 1, as 
there, is equal to acc — 1, or bb-\-\—acc ; it will fol- 
low, by the like fteps as in Propofitton 3. that 
— 2 
bd-\-ace — |— 1 
— a * 
cdfbe 
Prop . f. 
If likewife d z be equal to aee-^i^ as well as £ 2 = 
acc — 1) all other things remaining as in Propofi- 
tion 3. then fhall bd-^ace — ax cd\be + 1, t. e. 
i 
bd-\-ace — 1 
— ~ L a ' 
cd-\~be 
1. l^\-\z=.acc 
2 . d % -\-i=aee 
3 . b*d*±b*=ab*e z [ 2 .] 
4 ,. ac*d‘ z -\-ac t ~a z c z e t ‘ [ 2 >] 
5 . /Sd*+ac z =ab*e 2 -\- 1 [ 3 , 1 .] 
6. b*d*-\-ac*-[-ac z d z ==ac z d*-{-a*be z +l [f.] 
7. b % d*\-a*c- *e z =ac*d z ~) r ab t e z --\- 1 [6.4.] 
8. Pd'-Y 2abcde-\-a z c^z=aPdP-\-iabcde -\-aPe~-\- I [7. J 
.i - a 
2 . e. bd-\-ace z=.axcd\be + 1 * 
9 - 
bd-\-ace — 1 
cdfbe 
1 
Prop. 
