222 Of th SOLIDS 
felf, the fum of the quotients is equal to nothing. Therefore 
? 
——— — ee — ai | Se 
col scofe?.cofe  3fing.fin 9 
oi TE 7 Te ee Lae te eon Ol = Oy Oe 
tan?— ? 3 cofe? fin one 
% (1 —cof¢") _ s¢fing _ 39cofo _ 
cof 9" (tan 9 — 9) 3.col @ fin.g=,— bint 
fin ¢ sfing  3c0fp_.. 
WS core (an p—e) — 300T@ — fing —°* 
fin @ Ss cof ¢ q stamens = 
—————— 3 + Soe) 
cof g (tan @ — 9) 3 {in @ tan ?—@ 
HENCE | a = tan g@—@, and ¢ = tan o bat 
3 tang ~~ 5tang+9tan 9. cot ¢’— 3 tan bes 
5t+o9.cog 5+ gcotrg - 
2tang-+ Qcot 
5+gcotg © 
9 
ode ye 2ti+ot _ 
cs ie 
Let tang=?, thngo= 
oe 2 3 which, therefore, is the value of g when F is a 
maximum. 
THE 
